Why does my step mom hate me so much?

Anonymous
My dad remarried a couple of years ago and ever since then my step mom hated me. I've always tried my best to impress her and help out with my half sister but everything i do always back fires. like today i watched the baby from the seccond i woke um to ligit the minute she fell asleep. but still nothing. my step mother has 2 other children. she screams at them all the time. like today one of the girls hit the other. the one that got hit stormed upstairs and told her mom. she started screaming her head off saying your all at fault. she called me a whore and a bitch and many other offensive names. she said in older and i should be the one takeing responsibility for everything. she said im a shedevil that dirtyed her kids mind and made them behave like that. she said im a spoiled pain in the ass brat. but ligit she is the one always yelling she took over my grandmas house made it a mess and makes my grandma do the work. my grandma works nights at a bank and babysits the baby until she has to work from the seccond she wakes up when im not here. the house is constantly a mess and my grandma and i are the only ones who clean it. i live with my mom and visit here one month a year from jearsy. i dont want to visit but i have no idea how much time i have left with my grandparent and family. I've tried everything from jokes, cleaning the entire house, and babysitting the baby. she just still plain out hates me. she told me to tell her if her kids do anythig wrong but i can't do it because she will yell at me and say i have flaws too or something. i stood up to her last year and it was a disaster it was the first time i cried infront of my dad since i was 3. she said u always run to ur grandpa as soon as things get ruff.(grandpa from my moms side of the family) she always says she is the inoccent one and the target. she wacked her own kid with a plastic spoon now she has black and blue on the spot she was hit. what do i do?
Why does my step mom hate me so much?
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