I agree with the Skeezyks, many of us feel the conflict between the different aspects of our personalities and the horror of seeing the nasty me coming out, sometimes I don't even realise till later and it usually bites the people I love the most.

I hope you can find some help from T and learn some skills to help anticipate triggers that awaken P2 and be able to enable P1 so you can avoid the fall out from actions you later regret.

I have had some group training/ therapy which has helped me be more aware when things start building up and step back or give myself space and avoid acting out in my habitual way which has saved heartache or being blamed as The Problem.

It is possible to be more comfortable with the different aspects of yourself and behave most of the time in a more helpful way without rejecting the part of yourself you are less comfortable with.

Best wishes and good luck. You're getting help at an early age which is a great start.