Scandinavians are very friendly and pleasant people on the surface, but it's hard to penetrate that surface into deeper friendship. To really get into someone's inner circle of close friends you pretty much have to have grown up with them or known them for years.
Same with the Dutch and Belgians. The countries are so small and families rarely move very far from each other. This makes it very hard as an outsider to break into friendship circles as often they've known each other since pre-school.
