I'm so sorry you're in this situation, hanisahh. It sounds as though your parents have a lot of problems. Not only are they unable to give you the care you need and deserve, they also seem to be taking it out on you.
Just so you know:
1) Looking at your private correspondence is wrong
2) Hitting you is wrong, the more so with a weapon such as a hanger
3) Calling you ungrateful, crazy, selfish etc. is wrong
4) Implying that you owe them something is wrong... they've got it the wrong way round
5) False accusations and blaming are wrong
6) Interfering in your friendships is wrong
7) Punching and kicking you is wrong
8 ) Pretending nothing's happened is wrong
9) Threatening to kick you out or send you away is wrong
All of these things are so much worse when it's your parents who are doing it. They're the people who are supposed to love and protect you. Fourteen is hard enough for girls, with all the hormonal stuff kicking in. All this abuse -- and it
is abuse -- puts you in a truly horrible situation.
Please tell me there's a school counsellor, a trustworthy adult relative or a kind neighbour you would feel able to talk to. You're welcome to show them my reply here. Failing that, there might be a child abuse hotline you can call when it's safe to do so. I know you would be worried -- with good reason! -- about it being bungled in a way that leaves you worse off than you are now, but people there are trained to manage difficult situations like this.
https://www.childhelp.org/hotline/I want to add, the group chat with your two classmates sounds like a Very Good Thing. These two are likely to be lifelong friends and support.
Big hug from me, sweetheart.