My mother is acting like a child, help?

[Amatulla]

I just turned 17, my mom is in her mid 30's. I am the oldest of 7, and take care of them most of the time. My mom doesn't work, she sits around, nurse babies, and watch reality television (real housewives, basketball wives, etc). However, when my (step) dad is home, she tries to make it look as if she is bending over backwards cleaning, and yelling at her kids. She loves to divulge in my friends lives, and be included in our conversations. I know she may be suffering from PMD, since the last baby is 1. She constantly deny it. We think she may be pregnant, which is not helping. She is sooo moody, only happy when she watches her reality shows. I do the cooking and cleaning, am homeschooled, and a senior. I literally do not go anywhere, not even on the patio. However, I like to visit a 97 year old lady monthly, which my mother has a huge problem with. The old lady lives alone, and I love her dearly. My mom likes to act like those women on reality shows (by yelling, screaming, etc). I do not have a cell phone, facebook, twitter, etc, all I want is to be able to visit the old lady more. I feel so comfortable and happy away from home. Oh, and she constantly likes to try to battle me when she has no reality shows to watch. I will make simple suggestions or what not, and she gets all offensive. I will give her advice that she gave me, and she tries to flip it on me. However, when I do the same to her, she gets so upset. She loves it when I gain weight, and hates it when I lose weight. I cannot wait to leave the house, and be my own person. Did I also mention that I homeschool the children, mostly? I don’t ask for money, I want to volunteer, I want to work, but they say they need me at home to “help”. I’ve been doing on my own all of these years. However, when I’m chatting with my only friend in her presence and we talk about the stuff I have to do, she gets all mad and butts into the conversation trying to make excuses for her laziness. I tried to just look over her misbehavior, but she is constantly trying to get me angry in order for my (step)dad to see the “evil” in me. I am extremely close to him and it seems as if she wants us to “compete” for his….I have no idea how to even finish the sentence!? I have so much to tell, no one to tell it to, if I could get a little advice or something would be great. Sorry for the jumpy story, I am rushing to finish before she rouses out of her den. Oh, and my dad likes to side with her on everything, mostly. I can’t wait to get out of here, which she says to me when she is angry, but I feel bad for the rest of the little people. Lastly, the second oldest is only 12.
1) cant tape or redord her, my parents purposely keep those devices away from us. 2) cant sneak out and get a job; I don't go out anywhere. ever. 3) I am focused on getting into BArnard or Colombia, and going for medical school. They dont even want to pay for my application fee. I am trying to apply for a fee waiver at the moment. It is so difficult because I really dont know which steps to take first. Thank you all for your answers! Oh, and I tried talking to her; I just get rebuffed or flipped on.