Is my mum that bad, or am I just a horrible daughter?

I don't mean bad like she beats me, or anything. She makes sure I have things I need and food to eat (I was a vegan for a year, but I'm back to being a vegetarian.) But she's immature and it drives me crazy. It seems like every single day she is "sick" or "in pain." I think it's for attention. There's no way anyone is so sickly. She blows off her friends almost every time they ask her out because she's "sick," but gets super angry when they have to reschedule with her. She works from home, mostly, and always says she has work to do today, but never does any work. And when she does go into the office, she comes home and complains, which is okay, I'll listen to her vent, but it's dumb, little things. She's sort of obsessed with soap operas... She gets mad fast. I can't vent to her because everything she knows about me, she uses against me every time she gets the chance. She complains that I don't help around the house, but every time I see that something needs done, I'll do it. I got hurt a few weeks back and I couldn't even do cyber school because I couldn't sit up. She's unwilling to listen to reason when we argue, and she goes for personal attacks instead of sticking to the topic.

About me, I spend most of my time in my room and try not to hang around too much, but it's because I feel uncomfortable around other people, and when I'm around them, no one speaks much, anyway, and when anyone does, it's normally between my mum and her boyfriend. I seldom go out with friends. I'm not dating anyone. I don't smoke or drink. I've never been to a party. I'm a B student. I was bad in middle school and freshman year, but I've stopped hanging with bad influences and I'm way better. I would lie a lot, steal, and do poorly in school. I didn't care what people had to say about me because I was a little, ghetto f*ck. But I didn't sneak out, I didn't smoke/drink/party, etc... I tried to run away before and she called the cops, but I had my reasons. It was freshman year, though, and I'm a senior, now. She refuses to accept that I'm not that way anymore and can't see how I am, now. Am I way worse than I think I am? Right now, not back then... I think that a big reason she gets so aggressive with me is because she knows I don't really want anything to do with my family. I told her why, though, but she won't listen. I see how many problems there are in my family, and I've never fit in with them, anyway. Everyone hates everyone, there are big secrets... I just don't want any part of that. Oh, and my mum was and still is really in debt. She just bought and iPad from QVC and justified it with "EZ Payment," but my sister is without a headstone on her grave. She died in September 2010. She told everyone she'd take care of it, but she has made no effort to. She seems to me very immature and irresponsible. Am I out-of-touch with reality, here? And I know you know nothing more of us than what I've said here, but based on this, what do you think? And how can I improve our relationship, since she keeps complaining about it, but makes not effort to fix it?