>>10First of all, I just want to say I'm really sorry to hear your current problem, and I'm sorry someone at your age have to experience this, this is a horrible experience and you're still at the age of puberty, you're already dealing a lot about that and you have to experience this horrid experience nonetheless. I don't really know your problem entirely, but I smell some of the ol' "good parenting" these nutfucks think they are doing.
It's not your fault, you shouldn't beat yourself up or cut yourself just because you thought you were the one in the wrong and needed to discipline yourself. Trust me, hurting yourself won't help anything, except if you're a masochist and from your story, that's highly impossible. (Sorry if that made you feel worse, I was just trying to do a joke.)
However, running away like what Akako-san said in
>>2 wouldn't really help except if you have a plan. For example, you ask someone you could still trust or someone reliable who doesn't harbor bad thoughts about you to help find evidence of the shitty things those rodents have done like neglecting you and abusing you. Then, you'll want them to go to the authorities and provide the evidence. Actually, skip that. You're below 18 and 21, so go to child protection. The authorities gets their asses booked with reports like these so often, that they just stopped responding for at least 6 months I think. Child protection agencies, organizations, services, are way better at responding 'cause they actually have a just cause to help underage kids everywhere.
If you don't have anyone to help gather evidence, then I'm sorry, but you'll have to sneak out and go to a child protection organization yourself. Usually, they'll help you gather the evidence needed because they'll believe everything you say.
I'm sorry, but with the conditions you have, I couldn't really recommend other choices. I would say try improving your grades and do good deeds, but things have already gone out of hand. I would recommend "fight fire with fire", do things that seem bad at first but actually do something completely the opposite, but that wouldn't work as your "mother" would jump to the wrong conclusions and think of you even more badly.
Usually, when they say that a kid is a bad seed, they would point out that they had poor upbringing by their parents. I don't know how it is with your family, but the people who think badly of you are complete idiots. They should do a background check on your parents and see if your parents are these "saints" that just "unluckily" had a "bad" kid. None of this is your fault, your parents can just convince people that you're the "bad one" cause they're "adults" and that works with other "adults".
I'm a Christian myself, so all I can say is: stay strong and have faith. I know this a pretty cheesy line, but God has his ways. He will give you a way out, you just need to trust in Him and have faith. He never abandons His children. I'm sorry your parents are "those kinds" of Christian that do these things. Your parents are angry at their problems and unleash it upon you, which is a horrible way as children should've been everything that parents care about, even step-children. Why don't you go to your church (if you have one that is near), and talk your problems out to a minister, reverend, pastor, or any leader/member of a church.
I'm sorry if my second solution is a bit to devoted, but I've heard of a lot of people who had problems like these, gets their situations turned completely the opposite once they have faith. But still, try my first solution if you can and when you have the strength to do so. Remember, no action will go to waste.
Again, I'm sorry to hear your problems. Please keep all of us here updated with your problem. Remember, everyone here is a friend and we will want to help you with your problems. You're not alone, there are people here that want and will help your problems. Somewhere, someone out there, still care about you. So smile. When you think that this is the worst, don't. Have faith, think positive, and you'll go through your days without problem. Remember, everyone who hates you wants to see you downy and depressed. Give them a kick by still staying positive and happy and give them a big smile. That'll make them grit their teeth at the least. Again, stay positive, bad things wouldn't go unpunished.