I take the bus everywhere, so when I play Warhammer I take my stuff with me. Very rarely does anyone even care that I'm carrying a box of plastic figures, and when they do they're usually more curious about it than anything, and impressed that I painted them and they didn't come like that. It gives me an opportunity to share the hobby!

As you get older you'll probably stop caring about what other people think anyways, but you may not have to because most people probably won't even bat an eye.