Is it normal to hate my mum?

I feel like such a horrible person but I can't abide my mother.
She's never wanted me, as soon as I was born my grandparents (her parents) were lumbered with me. I do appreciate that she and my dad had to work but why have a child you can't look after?
My parents divorced when I was 7.
My mother always brags that she is the one who divorced my dad, I don't even care. He's happily married now and I love him to pieces. She's just lonely and bitter.
I live with her but I'll be going to university this year, thank goodness, but I'm scared I won't want to come back. Everything she does annoys me
She used to tell me that all my friends would message her telling her how much they hated me. She'd call me fat and ugly and constantly dictate what I wore and how i did my hair and makeup. She constantly smacks and tells me I'm the psychopath when she doesn't get her wAy. She's gained about 50 pounds, she smells all the time, she's ugly and I just can't stand to be around her. She's so unhygienic and spends all her time sat at the computer scratching her privates and stinking of whatever smell she has on her fingers. I've told her she stinks but have never mentioned her weight or appearance.
I don't want to end up never speaking to her again but I can't stand her and her ugly fat face, horrible personality, crooked teeth, and just her general hygiene. I know I don't have it half as bad as some people do but I just want to stop feeling sick to my stomach every time I look at her