When I was a sad and angry teenager, there was Wreck This Journal by Keri Smith. Now, there is You Need To Exist.
As someone relatively unfamiliar with Yungblud, I put on a playlist of his while I read through this and I can immediately see it fits. The journal starts with prompts on Identity (including anecdotes of his own life), and ends with the same so you can see how you change. There's messages of hope, freedom, confidence, and love, and even as an adult I feel very seen.
Some prompts are duplicates of Keri Smith's — write your own page numbers, draw around everything in your pockets — but most are new, bold, and inspirational, like sewing up a page of lips and cutting them free when you find the courage to speak up. Or filling a coffin-shaped page with regrets and glueing a lid on it ("you're not defined by your mistakes"). Or creating a mini-screenplay of a meeting between you and your fear personified.
As others have said, the layout of prompts feels erratic and suggests you destroy pages with no concern for the prompt on the back, but I guess there's something in not being a perfectionist and not following all the 'rules' to be learnt from it.
For the shy, creative, stifled, energetic, sorrowful, lonely, loving, loved, joyful, angry, beautiful people out there who need reminding that it's okay to be yourself, You Need To Exist is one for you.
Many thanks to Penguin Random House for providing me with a reading copy.