Is it normal i hate my sister

My older sister has this way of degrading you making you feel like utter shit. She seems nice at first but once you get to know her you realise what she truly is. She's one of the most vilest people I have ever met. I'm weak mentally and I can't Handle a lot of stress like other people, now my mum thinks I'm the bad person for trying to cut her off my life she says I got a black heart for doing that to my sister, she doesn't see the way she treats me. I thought about just ending before it but never this seriously, I want to live but I just cant handle all this stress boiling up other ppl just seem to handle it well but I just can't. Idk what to do