I never do my schoolwork/homework anymore

I’m sorry if this the wrong subreddit but I just need somewhere to vent and I thought this was the right place. So it was ever since 7th grade that I stopped doing homework. Why? Because the year before I had SO much homework to do, it was stressing me out like hell, and I stayed up late some nights doing homework. So in 7th grade I just stopped. I’m an 8th grader now, and I still have this habit. My older sister always gets mad at me for having bad grades and not doing my work, because I have only a month and a half left until the end of the semester, and I have NO A’s. She basically yells at me almost everyday. She sometimes physically hurts me by hitting me. I feel like a lazy bum. Does me not doing my schoolwork anymore make my future doomed? Does me not doing my work make me a bad person?

Side note: I hate my older sister. Another thing is that she’s neurotypical.