Part of being a writer is looking at the people around you. Orson Scott Card, author of more than 50 books, said,
“Everybody walks past a thousand story ideas every day. The good writers are the ones who see five or six of them. Most people don’t see any.”
Watching for stories all the time takes practice—but if you do it consistently, soon you won't be able to turn it off. Then, like me, you'll trip over sidewalks and your toes and turn your ankles all the time, as you think about the person you just passed, or the couple arguing in the drink aisle. I make it sound painful and hazardous, but it's worth it.
When you look for the stories in life, you'll suddenly have more than enough stories for your writing.