What can I do about my emotionally abusive mother?

Okay this is a long message so I apologize in advance. I made a post about my mother before but I think this might be the right place to post it.. My mother and I have had a rocky relationship for as long as I can remember, she was a single mother because my father walked out on her one day when they were fighting and from what I can remember she was the one being the aggressor. There are times where we have gotten along but it is usually when she's happy (getting money or I listen to every word she has said) I also suspect my mother might have NPD but I can not know for sure so I would like some insight..

I'm 22 years old now and I've tried to get a long with my mom as much as I possibly can, but I notice sometimes she will make snide remarks when something good happens or poke fun. Every time she says something insensitive to me she says it was "a joke" but it definitely does not seem like a joke to me.. if you're curious what was said, we were kind of in an argument and she called me a twit because I didn't see her point of view, but this is not the first time she's called me names.. she's called me disgusting, selfish, that I have an ugly personality, she also has said that she thinks my M.S is messing with my head and this is just a small list of "encouragements" she's gave me. I will admit at times I have been extremely rude to her because of some of these things she does.

She never takes responsibility for her actions or words and makes me doubt what was said saying "I never meant it that way" or "you're a drama queen", also "We'd be better off without you" (my grandma lives with us as well) To be honest sometimes I do doubt myself because even my grandma doesn't really take my side.. I think that makes it even harder because people actually do not say anything when she behaves this way even though she has acted this way to them and it also makes me incredibly sad, because if I seen this behavior towards somebody else I would stand up for them, but I guess not everyone has that intention.

We've gotten into a physical fight because she gave me something and I tried to get it back then she pushed me, hit my lip and it busted open, so I punched her back. I did feel bad for what I did, but I feel like I did not deserve that when she started an argument and then when she didn't like what she heard she decided to act out like that.. I don't know I know what she is doing isn't right but I feel incredibly trapped because nobody is even seeing my side at all my mom has even gotten my sister against me.. the weird thing is my mother has even acted this way with her and I would think of of all people she would at least stand up for me, but I guess I was wrong. I plan to move out as soon as I can and I've been trying to get jobs but haven't had much luck..

What should I do? I'm honestly worried about it, because I did move out before and it was very ugly.. She told me if I move out she won't even give me my bed that somebody gave me to sleep on and to me that is really unfair.. She treats me as if I am a little child and honestly I feel like one, because when I was younger this is exactly what I had to go through with her.

Unfortunately I am stuck here until I can save enough to leave and I have called her out on her behavior before and she totally denies it and said that I am abusive. I just would really like some advice, I know at my age I should already know what to do but after years of this behavior (it has only gotten worse) my confidence and esteem are completely shattered. I don't make a lot of money so what I'm really looking for is some advice on how to handle this situation and also maybe some tips on how to save up to move out because this will be my first time moving out on my own. I'm really sorry, but I feel completely crushed right now.