I don't fit in my age group. Do I have to fit in?
Why do you feel you don't fit in?
To be honest I'm sick and tired of being around immature people
If you think every one is immature you might be judging people too harshly. There are many kinds of people you can hang out with who are not immature.
Well I am tired of being around retarded people.
People do not always fit in with all of the people of their life. It is fine to not be good friends but do try to get along.