I have thought about this a lot. One idea I have is that you don't have to go very far back in time, to find that most Norwegians didn't socialize a lot with others than family and those closest to their home. Many people lived on a "sæter" a small farm, and it could take days to travel to see people, or they lived in really small communities. It's not a big country but it was little to no communication between the north, east and west because of our rough mountain landscape. Might sound dumb but that's my thoughts on why we are so strongly introverted as a people

On how to make friends though, just be the bigger man and take action, most people will be happy for it! We don't really do that, it doesn't come natural to many of us to speak with strangers with the intention of befriending them, but it does not mean we don't want to be your friend.

Good luck! And marry x-mas

Btw, where are you from?