Why is my mom such a bitch?

I hate her so much she keeps lying about things to me, gets happy when things go wrong etc. I would almost not believe she's my mother if I hadn't seen proof.
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I am almost convinced that my mom had a whatever attitude towards me since I was a child. I remember being neglected (she'd send me to school with my teeth not brushed), forget to pack my lunches, I can't remember many times that she was actually caring towards me.

She really is a bitch.
Why is my mom such a bitch?
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