Productivity in creative writing

On what subject(s) are you an authority? It’s not uncommon for people to feel like they can’t write. Nit because they do not have good stories, or they believe they could never learn how to use metaphors. But because they think they could never start and finish a writing book. They believe they don’t have the patience. They don’t have the time. Or they just don’t have the power personality. That’s nonsense. I grew up believing I’d be an athlete and I managed to write a 300000 word book at 16. Since then, I’ve written many b, with the fastest book I’ve written being written in 2 months with 180 pages. Point is, I know what I’m talking about, and I still have more I could.learn but that’s from you guys. Oo