Here is a promise, and a fact: you will never, in your life, ever have to deal with anything more than the next minute. However much it feels like you are approaching an event – an exam, a conversation, a decision, a kiss – where, if you screw it up, the entire future will just burn to hell in front of you and you will end, you are not.

That will never happen. That is not what happens.

The minutes always come one at a time, inside hours that come one at a time, inside days that come one at a time – all orderly strung, like pearls on a necklace, suspended in a graceful line. You will never, ever have to deal with more than the next 60 seconds.

Do the calm, right thing that needs to be done in that minute. The work, or the breathing, or the smile. You can do that, for just one minute. And if you can do a minute, you can do the next.

Pretend you are your own baby. You would never cut that baby, or starve it, or overfeed it until it cried in pain, or tell it it was worthless. Sometimes, girls have to be mothers to themselves. Your body wants to live – that’s all and everything it was born to do. Let it do that, in the safety you provide it. Protect it. That is your biggest job. To protect your skin, and heart.

Buy flowers – or if you are poor, steal one from someone’s garden; the world owes you that much at least: blossom – and put them at the end of the bed. When you wake, look at it, and tell yourself you are the kind of person who wakes up and sees flowers. This stops your first thought being, “I fear today. Today is the day maybe I cannot survive any more,” which I know is what you would otherwise think. Thinking about blossom before you think about terror is what girls must always do, in the Bad Years.

And the most important thing? To know that you were not born like this. You were not born scared and self-loathing and overwhelmed. Things have been done – which means things can be undone. It is hard work. But you are not scared of hard work, compared with everything else you have dealt with. Because what you must do right now, and for the rest of your life, is learn how to build a girl. You.

Love, Caitlin

This piece is part of Caitlin Moran's new book Moranifesto out this week (Ebury, £20) - buy it here.

Letters Live was held at Freemasons’ Hall from 10-15 March. More info here.

Images: iStock and Rex

“You were not born scared and self-loathing”: Read Caitlin Moran's heartfelt open letter to troubled teenage girls