Am I wrong/ selfish for not wanting to live with my sister?

I’ve never lived on my own. I have a child and enough stuff to have my own home one I leave my parents house. My sister and I have had many arguments, she has tried to fight me, talked about me being pregnant out of wedlock while I was pregnant and I don’t like her very much even though I love her. She says things that make me feel insecure about myself and my relationship. She takes medicine for a mental illness (bipolar). My mom is suggesting buying a home for us to live in. I do not want to live with her honestly. I feel like my mom is trying to throw her off on me. I already have a child. I don’t need drama or stress. And I don’t need someone trying to kill my self esteem everyday.
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