Should I cut my family out of my life when I graduate?

I have been emotionally abused for way to long. It wasn't like this when I was younger, but when we moved to a different state everything changed. My parents were acting different and my sister became some spoiled brat. My parents are nice on some days and terrible the next and this has not helped my self confidence. My first year of high school I got barely a 3 GPA and if I keep going like this I will not get into my or my mom's dream college for me. I get some support from my parents, but they don't realize I'm a VERY slow learner and my school is very challenging and they get mad why I don't get good grades. I dedicate myself to my studies but when I take tests sometimes I don't finish.

My sister doesn't have to study and gets amazing grades, but she is very rude and sassy. She says things and does not consider how her words may hurt others. When she entered 5th, 6th grade and beyond she would ruin me. She would call me ugly say to me that you have no friends. I have changed schools more than 4 times and because of what my sister says it has been hard to make friends because of my self confidence. She even talks like this to my parents and somehow she gets everything she wants. I begged my parents to get a phone for my in middle school but somehow she got an iphone when she was 8.

My parents are financially stable, so it may seems that I have no reason to complain. But things are not going well at home and I feel like they are the reason I'm not doing well in my self confidence and in my studies. I'm very homesick and talk to my old school friends everyday. I'm just not happy with where I live, my family, my school, myself. I need a fresh start. What do you guys think?

I have been crying for an hour now because of the things my parents and sister said to me and I have neglected to get any school work done. I have had enough and I need help.
Additional Details
I have also been bullied and I have been to school been bullied and then my sister bullies me more at home. I love my family but I'm tired of their abuse. My sister lies to save her back when I tell my parents then I or both of us get in trouble when I was the victim. I get in trouble for being the victim!

SAME BRO!

Ik how you feel right now. What I would suggest it you wait till you get a stable good paying job and then cut them off totally.

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