Half of all the people in the world are below average. I know, it's crazy right? Confirmation bias makes us expect others to be like ourselves, but they are not, and you're going to have a bad time when you expect them to be like yourself. This is probably going to sound harsh, but it's true: Children and teenagers innately sneer at others that are not like themselves (so much bullying in schools). Part of maturing as a person is to learn that other people are different and have different needs. Many people don't learn this, and they seem immature as a result, and they are ineffective at dealing with other people.