My first diary entry appeared on 3 January 2009 under the heading I AM AFRAID: ‘I had a terrible dream last night filled with military helicopters and Taliban. I have had such dreams since the launch of the military operation in Swat.’ I wrote about being afraid to go to school because of the Taliban edict and looking over my shoulder all the time. I also described something that happened on my way home from school: ‘I heard a man behind me saying, “I will kill you.” I quickened my pace and after a while I looked back to see if he was following me. To my huge relief I saw he was speaking on his phone, he must have been talking to someone else.’

It was thrilling to see my words on the website. I was a bit shy to start with but after a while I got to know the kind of things Hai Kakar wanted me to talk about and became more confident. He liked personal feelings and what he called my ‘pungent sentences’ and also the mix of everyday family life with the terror of the Taliban.

I wrote a lot about school as that was at the centre of our lives. I loved my royal-blue school uniform but we were advised to wear plain clothes instead and hide our books under our shawls. One extract was called DO NOT WEAR COLOURFUL CLOTHES. In it I wrote, ‘I was getting ready for school one day and was about to put on my uniform when I remembered the advice of our principal, so that day I decided to wear my favourite pink dress.’

I also wrote about the burqa. When you’re very young, you love the burqa because it’s great for dressing up. But when you are made to wear it, that’s a different matter. Also it makes walking difficult! One of my diary entries was about an incident that happened when I was out shopping with my mother and cousin in the Cheena Bazaar: ‘There we heard gossip that one day a woman was wearing a shuttlecock burqa and fell over. When a man tried to help her she refused and said. “Don’t help me, brother, as this will bring immense pleasure to Fazlullah.” When we entered the shop we were going to, the shopkeeper laughed and told us he got scared thinking we might be suicide bombers as many suicide bombers wore the burqa.’

At school people started talking about the diary. One girl even printed it out and brought it in to show my father.

‘It’s very good,’ he said with a knowing smile.

I wanted to tell people it was me, but the BBC correspondent had told me not to as it could be dangerous. I didn’t see why as I was just a child and who would attack a child? But some of my friends recognised incidents in it. And I almost gave the game away in one entry when I said, ‘My mother liked my pen name Gul Makai and joked to my father we should change my name . . . I also like the name because my real name means “grief-stricken”.’

The diary of Gul Makai received attention further afield. Some newspapers printed extracts. The BBC even made a recording of it using another girl’s voice, and I began to see that the pen and the words that come from it can be much more powerful than machine guns, tanks or helicopters. We were learning how to struggle. And we were learning how powerful we are when we speak.

Some of our teachers stopped coming to school. One said he had been ordered by Mullah Fazlullah to help build his centre in Imam Deri. Another said he’d seen a beheaded corpse on the way in and could no longer risk his life to teach. Many people were scared. Our neighbours said the Taliban were instructing people to make it known to the mosque if their daughters were unmarried so they could be married off, probably to militants.

By the start of January 2009 there were only ten girls in my class when once there had been twenty-seven. Many of my friends had left the valley so they could be educated in Peshawar, but my father insisted we would not leave. ‘Swat has given us so much. In these tough days we must be strong for our valley,’ he said.

One night we all went for dinner at the house of my father’s friend Dr Afzal, who runs a hospital. After dinner, when the doctor was driving us home, we saw masked Taliban on both sides of the road carrying guns. We were terrified. Dr Afzal’s hospital was in an area that had been taken over by the Taliban. The constant gunfire and curfews had made it impossible for the hospital to function, so he had moved it to Barikot. There had been an outcry, and the Taliban spokesman Muslim Khan had called on the doctor to reopen it. He had asked for my father’s advice. My father told him, ‘Don’t accept good things from bad people.’ A hospital protected by the Taliban was not a good idea so he refused.

Dr Afzal did not live far from us, so once we were safely home, my father insisted on going back with him in case he was targeted by the Taliban. As he and my father drove back, Dr Afzal nervously asked him, ‘What names shall we give if they stop us?’

‘You are Dr Afzal and I am Ziauddin Yousafzai,’ replied my father. ‘These bloody people. We haven’t done anything wrong. Why should we change our names – that’s what criminals do.’

Fortunately the Taliban had disappeared. We all breathed a big sigh of relief when my father phoned to say they were safe.

I didn’t want to give in either. But the Taliban’s deadline was drawing closer: girls had to stop going to school. How could they stop more than 50,000 girls from going to school in the twenty-first century? I kept hoping something would happen and the schools would remain open. But finally the deadline was upon us. We were determined that the Khushal School bell would be the last to stop ringing. Madam Maryam had even got married so she could stay in Swat. Her family had moved to Karachi to get away from the conflict and, as a woman, she could not live alone.

Wednesday 14 January was the day my school closed, and when I woke up that morning I saw TV cameras in my bedroom. A Pakistani journalist called Irfan Ashraf was following me around, even as I said my prayers and brushed my teeth.

I could tell my father was in a bad mood. One of his friends had persuaded him to participate in a documentary for the New York Times website to show the world what was happening to us. A few weeks before, we had met the American video journalist Adam Ellick in Peshawar. It was a funny meeting as he conducted a long interview with my father in English and I didn’t say a word. Then he asked if he could talk to me and began asking questions using Irfan as an interpreter. After about ten minutes of this he realised from my facial expressions that I could understand him perfectly. ‘You speak English?’ he asked me.

‘Yes, I was just saying there is a fear in my heart,’ I replied.

Adam was astonished. ‘What’s wrong with you people?’ he asked Irfan and my father. ‘She speaks better English than the rest of you and you’re translating for her!’ We all laughed.

The original idea for the documentary had been to follow my father on the last day of school, but at the end of the meeting Irfan asked me, ‘What would you do if there comes a day when you can’t go back to your valley and school?’ I said this wouldn’t happen. Then he insisted and I started to weep. I think it was then that Adam decided he should focus on me.

Adam could not come to Swat because it was too dangerous for foreigners. When Irfan and a cameraman arrived in Mingora, our uncle, who was staying with us, said over and over that it was too risky to have cameras in our house. My father also kept telling them to hide the cameras. But they had come a long way and it’s hard for us as Pashtuns to refuse hospitality. Besides, my father knew this could be our megaphone to the outside world. His friend had told him it would make far more impact than him roaming from pillar to post.

I had done a lot of television interviews and enjoyed speaking into the microphone so much that my friends would tease me. But I had never done anything like this. ‘Be natural,’ Irfan told me. That wasn’t easy with a camera trained on me everywhere I went even as I brushed my teeth. I showed them the uniform I couldn’t wear and told them I was scared that if the Taliban caught me going to school they would throw acid in my face as they had done to girls in Afghanistan.