My mom is hurting me, and she think everything is fine!?

I am a full time college student i am 19 years old and i feel all alone. My mother's boyfriend just got out of prison and she only comes out of the room when he is gone, when he is here she barely talks to me but when he leaves she want to spark up a conversation. Basically im invisible when he is around! I have no problem with her being in love but it makes me mad because she expects me to talk to her when she wants to, but is never there when i want to talk. She basically is like a slave she does everything for him, she misses work for weeks in a row just to be up under him all day it is crazy i have a little sister and she makes my little sister walk from school in the Hot sun while my step dad has the car running around doing God knows what! I really want my license but she always making up exec uses like i have to wait next week to go get them and when that week comes she never takes me, I am looking for a job and i filled out applications on line but she promised to take me job hunting and when i ask she is too busy! Being independent is apart of growing up but everyone needs help once in a while. I have made the decision to just forget about her helping me and do everything myself! It really hurts me that she is not helping me like she promised! Today she said she couldn't take me to get my license because she had no Gas! Two hours later she hops in the car with her boyfriend and they parade around town! WTF ! i WAS SAVING MY MONEY I HAD 130 Dollars she gave me this sob story of how we needed groceries so i gave her all of money and now I have none :( I am always there for her when she needs me but it hurts she is not there for me right now. She is a good mother, but she is changing. I wish her boyfriend didn't have her under a spell:( How can i get my license with no car? How could i get a job with no transportation to help me look? How can i do anything and i have no money because of her? Why is my mother acting as if nothing matters now that my step dad is out? He is not an evil step dad and i don't blame him i blame her because he is not forcing her to act this way! She ignores my little sister, My sick grandmother, and Me when this man is around! I am happy that she is happy, she have the biggest smile on her face when he is around and I love that, But i hate the fact that she is not going to work, and not sticking to her promises! I NEED HER TO HELP ME RIGHT NOW PLEASE HELP!