Can your therapist friend help you find a therapist who could take you as a non-paying patient?

Or, could he help you find a free or inexpensive self-help group of some kind, that meets regularly and includes a therapist?

Or does he have other helpful ideas for you?

Could your school help you convince your parents of your need and desire for help?

In the meantime, find some books on Assertiveness or Assertiveness Training.
Confrontation, frustration, fitting in, being accepted, anger, are all part of life and don't go away no matter where we go. I like that you want to deal with this now, that you don't like the way things are, and I suspect you wish to not feel so much anger.