How To Build A Girl by Caitlin Moran
The blurb on the back:
My name’s Johanna Morrigan. I’m fourteen, and I’ve just decided to kill myself.
I don’t really want to die, of course! I just need to kill the old me, and build a new girl. Dolly Wilde will be everything I want to be, and more! But as with all the best coming-of-age stories, it doesn’t exactly go to plan…
Masturbation features on the very first page, setting the tone straight away for this hilarious book!