What can I do about my mom calling me retarded and slow?

I was a premature baby (2 months early) and according to my mom, the doctors said that I was perfectly normal. However, my mom and I rarely get along and we always argue, and now, she thinks there's something wrong with me. She calls me #$%$, slow, mentally ill, and she says that I need medication. So, we go to a family therapist, and our therapist said that I didn't need medication, and the only problem with me was that my mom and I have poor communication. But my mom continued to tell the therapist that I'm slow because I was born too early and that I need medication. I don't think there's anything wrong with me, I'm just quiet and sensitive. But my mom thinks otherwise. I don't know what to do. It really hurts having my mom call me those names and believe that there's something wrong with me when there's not. I also talk to another counselor, and she says that my mom is the one with the problems, not me. Whenever I tell my mom that the problem is with the both of us, she always switches the conversation, and say that I'm the problem. I just don't know what to do. I'm 18
What can I do about my mom calling me retarded and slow?
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