It depends. You can ask to see a counselor at school, but that is usually time-limited (they don't do long-term treatment). That counselor can give you better advice about how to go about finding a T.

I don't know your situation, but have you considered asking your parents to see a T without telling them why? You can simply tell them you need help with something private. Your school counselor could also help you with this.

Please let us know how your search is going!