Going out of our comfort zone is hard, the best way to actually get out of our comfort zone is by having friends that "force" us to step out of it! I don't know about other people but i would go against the world if my some of my friends asked me too.
We all have something to offer, even if we spend our whole days watching TV shows we can talk about those TV shows, if we read a lot we can talk about what we read, everything we do is important and makes us valuable!
Good point @teutonium. It is definitely good to have friends that challenge you regularly and help you see things from another perspective.