How to deal with frustrations

Hello,

I get little support and my therapist works against me all the time as she reads my behavior and not me and listens to my dysfunctional parents (politician). I read that I internalize everything because I have a brain tumor. I try to tell them this but the laugh and say I am full of myself, which I am not. It makes me feel suicidal in that I am constantly battling people. Sometimes I just give in and then I get hurt and they laugh more. I have always been teased my entire life. Just want it to stop and me stop getting hurt and me hurting myself. To believe in myself.