I would write in a realistic style about things I experienced happening to other fictional people in a different form which means that all in all I share my thoughts in the book without writing a nonfictional text.
I write stories and I want to be a astronomer and a writer in the future. I write about fiction, science fiction, romantic and which I like. I'll write my autobiography.
I write about ancient or imperial dynasties of different countries, and then I add some fantasy elements that have something to do with that culture. Before that though, I would look deeper into the culture.
I'd like to write a book about the feelings of pensioners: what do they think about, do they try to analyse their past, have they got any plans or maybe some troubles to solve. It'd be like a combination of thoughts of different people, their point of view...