What have I done to my aunt?

I live with my aunt and uncle (who's my mother's brother) and their one son, because my mom passed on and my father is out there with his family. My aunt fucks with me in front of me but when I'm not around her she talks all types of evil things you could imagine. I once had an altercation with my uncle and she was very happy that me and my uncle fought, so later that day I went to my uncle while he was alone and I asked for forgiveness for my behaviour and my aunt entered the room while my uncle said that he forgives me and got very pissed and asked me straight up Why are you forgiven so easily? .There was also this time I asked my uncle to buy me these cool sneakers and she asked me why would my uncle buy me sneakers when she had asked for a washing machine. She always reminds me that she's not my mom through her actions and she has told me that she's not my mom. She takes out her frustrations on me and expects me to be cool with her behaviour. Nothing that I do impresses her and she never has my back but expects me to have her back... it's just a lot. She has no idea that I know what she says or do behind my back.
What have I done to my aunt?
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