School has ruined me mentally but I don't want to disappoint my parents

[Mpapf]

I'm in my senior year of high school and it has ruined my mental health, I hate how school takes up the entire day, I don't like the constant assignments that are shoved down my throat, I feel pretty lonely and alienated at this school, which is a 6-12th grade art school, there is a class called "advocacy" that is virtually useless but you must go to, you don't do anything in Advocacy. I have a learning support teacher who is a jerk and whenever she explores the hall and sees me decompress and calm down out in the hall, she immediately assumes I'm deliberately skipping class and slacking, even when I repeatedly tell her that I'm just calming down and that the teacher encouraged me in reality to go out in the halls to calm down. Another thing is that in Advocacy class, there is this other teacher plus the main teacher who seems to be there just to be there, but he seems more like a guard who constantly follows me and just stares at the class, but in particular, he's creeping me out, he even followed me to the bathroom but he didn't luckily go directly in it as I'm a girl. I've repeatedly been telling my parents about this but they pressure me to "suck it up" "you must get an education" "you will miss out on learning" "everybody hates school" "you have to do things you don't want to do" etc, which just makes things even worse, I just really want a break from school, a break from the creepy teachers, but my parents are extremely strict about attendance, and they almost never let me stay home from school, and there have been some days where I feel like partaking in self harm due to me hating school so much, what do I do? How can I keep both my parents and myself happy?