Honestly, it's a little crazy . But maybe think about places you can go that aren't super-populated? For instance, go take a walk or do things outside, instead of going to a crowded mall. Host movie night at your house instead of going to the theater. Or go out to dinner on a weeknight when the restaurant isn't crowded.That way, you won't be cut off from the world, but you also won't be in situations where you feel really uncomfortable.
Be sensible about washing your hands, don't touch your face, and stay hydrated. If you DO get the flu, it'll suck, but if you're watching out and aware of symptoms, you can get care quickly and early, and you'll be fine.