Why people from my generation millennial are envious and jealous of each other?

I would have tough that once people past over the age of 25 we would be mature and act like actual adults. I noticed that mostly people around my age love being in competition envious of others success. One of my cousins who happens to be my same age got upset about me owning a home and having a well paid job.

Why people from my generation millennial are envious and jealous of each other?
Post Opinion