Humans act kinda however their environment teaches them to act. Societies exist along a spectrum from encouraging people to be individuals to encouraging people to feel like part of a community. Most western cultures trend towards individualism. When we see ourselves as individuals, we’re more likely to see those around us as competitors.

That’s my guess at least. Judging by the way your typing in English I’ll assume you’re in the individualistic part of the world like me, and yeah, kinda sucks for most people. Personally, I think the fact that most people are upset with the nature of the society we live in is proof we’re supposed to be more community oriented.