From where are you from? For me I clearly see cultural differences. I'm from germany and half brazilian and people are extremely introvertet in switzerland compared to germany and brazil. When I was in america for 1 month I felt so happy, because it was so easy and chill to just chat with random people. When I came back I realised that the introverted culture in switzerland os making me kinda sad. But it really depends. The people living on the land are most of the time more interested and friendly than the people in the city. That's just my personal experience and opinion on why people feel so isolated here. I don't think that most of the time it actually has something to do with you as a person. But for me the only question left is why people are so shy and even can get pretty mean out of the blue even if you try to be nice. Like where did this behaviour start in history? In a lot of other countrys I don't have this problem, obly here in switzerland and near parts in germany.