When is too much, too much?

I know there is a saying that goes something like "Your parents take care of you and once you get of age, you should take care of them"... I have no idea if that's right or not, but I don't believe that's the way it should go. Especially when you can't afford to do it and when it isn't a personal option.

So this past week was ok.. Didn't do that much but the end of the week is where all the action was. I did some hair and my mom was telling me how she has a interview and she needs to color her hair but she didn't have the funds. So I took it upon myself to spend my little dough & buy her the hair color. Then she reminded me that I needed to put gas back in the car since I took it, with my last $15 I filled it up. My issue with this (and all the other little things I do for her) is that I can't afford to do it. Yes, I make a couple bucks doing hair then and again; but it's not frequent enough to where I can make a living out of it. She doesn't even say thank you for it. Her reasoning behind it is that she is and has taken care of me and now it's my turn. With that she includes her buying me groceries and keeping a roof over my head like I'm the only child. She doesn't take to the fact that I didn't ask to be here and that this is her responsibility as a parent. Even tells me I'm wrong to think like that.

Since I've been talking about moving out and trying to get myself together (finally); it's like none of that matters. I need to contribute to the house so some of the load can be shared. But that load is going to be there if I'm still living at home or not. Back when I was working regularly, I noticed small things she use to do that were in my mind, very unfair. She would tell me that my part of the car insurance was more than it really was so she could pocket some money; make me pay her rent weekly, and ask for money for groceries or gas. Why would you do that to your child? I use to argue with her that most kids I knew didn't have to pay their parents rent. But her and my father both agreed on the issue so I did it. After I noticed her going shopping for clothes & shoes with my money, I stopped giving it to her and put it on bills instead. Even this caused disagreements and arguments. Now, I'm at the point where I need as many jobs as I can get to pay a majority of my debt down so I can leave. I seriously can't take it anymore. My little brother has more pull than I do around our house, I don't even get a choice and I'm grown.

I guess it's finally hit me that I do too much for her when I could be doing for myself more.