I'm not sure if i'm making a selfish decision about the way i act

Try to think of this as if you were me. Think of it as you being in a family of four, with one sibling, and two parents. (The sibling isn't that important for this question) My mom has a lesser form of depression, and my dad does whatever he can when he can to make her feel better. Unfortunately, it's in my nature, as her daughter, to get into arguments with her all the time. Whenever my parents fight, it's about me. I cause practically all the problems in my house. So, my question is, if you were me, with a depressed mother and all her reasons being depressed being you, would you blame yourself and become another depressed person your father has to deal/argue with/take care of, or would you try to help your dad to make her happy, because it's hard enough for him already, he has to deal with both of us always being in a bad mood. (I'm the depressed option)