I don't write down my experiences, but I have a very decent memory. I have tons of books in which I write down phrases as they occur to me. That's how I write songs. I'll need a line and I'll go through the books and find it, the right rhyme and everything.
I think everything happens for a reason and all the things that happened to me - good, bad - I'm glad they did. It's made me ready for life, for adulthood.