If you really think it's impossible to befriend a Norwegian as a foreigner I think the problem lays within you, not the typical Norwegian. It might be your original place of recidence and culture, and or cultural/religious view that generally don't interests the typical Norwegian. Yes, we have a very different aspect on greeting and talking to strangers, but we don't shy away from friends and family as a whole, we are a friendly and inviting people, with a whole lot of hospitality, but on the other side most of us won't greet you on the bus if we don't know you, that's just how it is. Also there's a big difference when you go more north, they are more free spoken and easier to connect with. That's just my two cents on the matter though.