You're not over-reacting Savv. I'm sorry that I didn't see your post - the first 5 posts made by a user often show up delayed as they need to be reviewed. So now that I've seen this, I'm responding and your post will be at the top for others to see as well. I just want to make that clear to you right now - that you have not been ignored in this forum, your first posts just get missed sometimes (not just yours!).
The things that your mom says to you are wrong, and you don't deserve them. Since you still live with her, I'm assuming you're in highschool still? I could be wrong, but that's the guess I'm making right now.
Has your mom always been like this to you, or has this started after your parents split? There's no excuse for your mom saying those things, but if she's having a hard time with adjusting to being on her own (especially since she says you don't do enough??), well, how have both of your roles at home changed now that your dad isn't in the picture? Maybe she is trying to ask for help and doesn't know how.
Now, now that I'm done with saying that - she needs to remember that SHE is the adult and it's NOT your job to take care of her - that's a role reversal there as it's her job to take care of you.
Can you go and talk to a counselor at your school? It would be good for you to actually talk about things with an adult that you can trust - your mom is treating you like s*** and you're dealing with your parents splitting. Both are understandably HUGE stress factors in your life).
You are good enough, ok? Your family might not be realizing that, but they're wrong. You're not overreacting. You deserve to be loved and treated kindly by your family, and you deserve to feel supported by them.