I think that age was horrible, when you had no power to choose your own tribe of people. You got grouped together with people you didn't choose yourself, and what's worse, those people were kids who sometimes has no empathy whatsoever.
It really was the worst time in my life personally and I often felt like I just wanted to end my life.
Luckily I came through, and life as an adult is a lot easier. We still get grouped together with strangers at work, but there are unspoken rules how to behave as an adult that most adults actually follow. Also most adults have some degree of not wanting others to feel bad.
There are exceptions however. Some people are just mean.