It all depends on who's watching.
If the story was following me, I'd be the hero. If the story was about someone who's in opposition to me, thankfully there aren't many, I'd be the villain (well, antagonist, at any rate). If you catch me just eating dinner while you're following someone else, I'm an extra. It's not like the people in the "background" wouldn't be people with dreams, troubles, and ambitions.
You ever go to a restaurant and see a celebrity or someone eating dinner? In your life, they're an extra, but they're major players in other people's stories.
The story follows whoever's holding the camera.