An autobiography is a book a person writes about his own life and it is usually full of all sorts of boring details.
I know I live a charmed, beautiful life and nobody wants to hear a celebrity whine. The last thing I want to do is complain; I love what I do and I know every job comes with a downside.
So in the first draft, I'm inventing people and place with a broad schematic idea of what's going to happen. In the process, of course, I discover all sorts of bigger and more substantial things.