How do I get rid of this rage I feel for my family?

As I have previously stated, there have been a lot of problems in my family. Both my mother and uncle are bipolar. I can’t trust my mother. I’m not sure I will ever feel that I will ever trust her judgment 100% again. My dad is a self absorbed, transgendered guy. My grandmother is an elderly woman who will never take any responsibility and prefers to inflict her guilt complex on me because she thinks she can control me. I am on the verge of graduating high school and have never felt truly happy. Even at times when I should have felt happy, I felt depressed or withdrawn. I can not stand my mother and grandmother. Please don’t take me as an ungreatful brat, but I feel the characteristics I have did not come from them. I have a strong work ethic, have been told I’m sweet and intellient and classy but its taken work. Sometimes I feel like such a fraud, especially when I lose it at home. I acknowledge my grandmother will never change and that if my mom relapses yet again, that it is not my fault. I was the one who looked for a therapist and who has been seeing one regularly. I also went to one before. How can I stop losing my temper when one of my family members comes around and tries to buy my affections back or who won’t leave me to do the things I have to do in peace?