Human being is a social animal.But not all human!
Now a days, teens are feeling more inferior to others.Scientifically it known as inferiority complex.
Main way out from this situation is to welcome strangers.
Firstly,it will be hard .But determine yourself for a change.Everyday meet a new friend.While travelling or in canteen and so on.
This suggestions are mostly for those who are feeling inferiority complex.
Good luck!