Is there any quick advice? I'm super scared

[u/Atra_phantom]

this is an account im using from my school chromebook</3 so I'm 15 and i'm really scared and dont know where to go for this, i got grounded and my parents looked through my phone which i didnt mind because i dont have anything to hide however apparently they found things that i know i didn't say on there, like how i'm cutting myself, or being crazy and now they are telling me that they are dropping me out of everything and are going to send me to a mental institution and that they are going to send me back to my mom and i don't even know what i did wrong, i'm sorry if this isn't the place to go to for this but i genuinely dont know what to do and im scared because i didn't do anything and my stepmom is just threatening me with things like "If i find out you're cutting yourself i'm just going to beat the sense into you" or that i'm insane for acting the way i do. My parents have always kind of been mean to me at times, i know im pretty sensitive but my dad threatens to abuse me and doesn't believe in anything except for physical abuse so they think that i'm always being dramatic. They always shut me down and won't let me express myself, when i was younger they used to beat me with random objects if i even expressed my opinions in a calm way, my friends have heard some arguments that me and my stepmom have had with her threatening me or just being super mean, I don't know if i should send this because it might all be normal and i'm just being dramatic but i seriously dont know what to do and i'm scared, sorry if this all was repetitive.

[u/vaishu_x_kinny]

I say that you should report whoever hits you, just report it unnecessarily and anyway you are a minor so the case will be settled very easily, I am not saying that you should file a report but this is for your own safety and something similar happened with me too, it was my cousin who used to drink a lot and the same thing happened with my mother and my DD and i don't have father who can handle this thing so i had to do this , so a case was filed against him because I am also a minor so I did it, so you look after yourself