Why do mother’s hate their daughters?

I have never had a good relationship with my mother, as a child only thing she would was yell at me for everything. My grandparents which are her parents always mistreated me as a child, they always have favoritism between the grandkids. Everytime I would come around, my cousin would hit me or break my things and when I would say something. They would either hit me or tell my mom a different story, then she would whoop me over a lie they told on me. I remember when I was pregnant with my 2nd daughter I asked my mom to stop telling my business to them and she hit me in the face with a water bottle. I felt like as a parent she should’ve put them in her place but she refused to. It was a time in my teenage years I was depressed, I came to her for help but she told me I was crazy. 9 years old I got my first period she told the whole family I was so embarrassed. My mom told all my business to her friend and the friend called me on the phone trying to give me advice on my life. Even the friend had a habit of messing with married men. So I cursed the friend out she threw a big stack of folders in my face. At 13 her and my dad had a friend who was always fond of me, he would always say I’m pretty which made me feel uncomfortable. I tried to talk to her she said well you are pretty so what’s the problem. It was a time when my parents went over to his house and my parents made me get out the car to say hi. The friend says “damn that girls fine”. I felt so uncomfortable. When I got pregnant with my 2nd daughter my mom told me I was a hoe and that me and my baby were going to die of harpies/Aids mind you we had nothing it was only because she was mad I was pregnant. She treats my youngest different than the first one. My mom has always did stuff to sabotage me on purpose is what it seems like. She would always pick with me or try to whoop my kids. Or my special needs brother she would always push him off on me so I really never got to be a kid. I always had to babysit him never got to go out with friends nothing. She never liked anyone I dated. She would also try to start arguments between me and my dad. At 16 I got pulled into the bathroom in high school got raped was bleeding from my vagina and butt. Tried to tell her she pushed me away.At 15 I lost my v-card to a 19 year old. I exactly say if it was rape or not, but I didn’t want to do it. I only agreed because I was in his house so I felt like I didn’t gave a choice. My mom never taught me the difference. My mom and her parents never had a good relationship she would always buy and do for them but in return my grandfather kicked her in the stomach at 21 and beat on her her whole life. So it’s a pattern I tried my whole life trying to better the relationship with more conversations gifts etc. when she is around people she tries to put on this act like we have a good relationship, I go along with it but at 28 years I cut her off last week. I can’t do it anymore she never takes accountability for nothing, she starts problems with everyone. I just got tired of her treating me any type of way. I got beat with a belt, shoe, chair, extension cord. Hands, feet and fan. She even hit me in the face with a brush, because I wasn’t holding my head right while she was doing my hair.It’s a lot of other things that happen as well. She even hits my dad sometimes too or she gives him hell. I just needed peace and I want my children to know/ be raised different so she is not allowed to see them either. Going to change my number soon I’m just tired I always wondered why she treated me like this. Even when she got sick I took care of her even when she called me I came running. But you know what I got the opportunity to make sure me and my kids have a good relationship.