I've never finished a book. I haven't finished a story in years. Every time I find something I'm interested in writing I either lose interest in the topic or lose confidence in what I thought was worth writing. I don't want to start something and commit if I'm just going to be bored finishing it, but I can't figure out what I can write that I'll stick with. I've done this all my life. What am I doing wrong? What do I need to do right?
Note: I feel most confident writing nonfiction. I tried for years to write fiction, and when I was younger, I was told I was a good writer [for a kid, I guess], but months ago I started a novel and the first 80 or so pages were rotten. I was told so (in a hyperbolic fashion).