Is my friend really my friend?

I have a friend at school, met her at the beginning of this school year and since I transferred schools last April, I only had a couple of friends. I can just say that many of the Americans I've met are...I don't know how to describe it. They kind of surprise me, saying things to the teachers that no one back home would say, and it's nice to have some people I can somewhat relate to. I'm Asian-Canadian, by the way.

The friend I met this year is kind of...Well, I don't really know what to think of her;

-She's rude to my family, my other friend's families, and her own family

-She's getting me in the habit of constantly swearing while talking

-When I just need some alone time during periods, she'll just ditch me at the end of the period

-She constantly complains to me about things I don't care about, but I listen anyways, since I could never tell a person to shut up face-to-face, even if I truly hated them, but whenever I want to tell her something she doesn't like, she'll tell me to shut up.

-Whenever I mispronounce things (I said 'New Hampshire' as 'New Hampshai-er', which is supposed to be said as 'New Hamp-shir', Arkansas, which I said, literally, 'Ar-Kan-Sas', when it's something similar to 'Arkansaw' and Communism, where I accented the wrong parts of the word) she'll laugh at me.

-She'll always rant about how she isn't as good as I am at the arts, when she only spends a few minutes a day with flute and barely practices drawing and writing. To be honest, it's kind of annoying, since she's the only one who doesn't respect how hard I've worked to become better at it.

-And, excuse me for being rude and blunt, but my parents don't like her, (they say she's rude and fat and doesn't study, though she's in all honours, it's not that hard to get into honours, most of the kids are in honours class) and it might just be my Chinese blood, but she is kind of ugly. And overweight. She doesn't give a care about actually trying to notice how she looks, and I'm sorry, but if she was nicer to me and my other friends, I wouldn't really notice these things. I mean, I know a bunch of people who are wider than regular, but I never really noticed that feature about them until I really thought.

-She tries to make me listen to music I don't like

-I can't really tell if she truly cares about me or not; she says she does, and when I told her that she really pisses me off at times online, she apologised, but I can never tell whether or not she means what she says.

-Okay, I'm seriously starting to rudely rant now, but she just has a huge ego...She likes to say how awesome she is, even when it's clearly annoying, and she likes to sing off-tune Japanese songs and say she's attractive and anime boys would like her (I know I'm very plain-looking, so I never pretend to be different than that, but still, she doesn't seem to realise the truth about herself).

But she's one of the only few friends I have...I'm sort of an otaku as well, I like manga and anime, like my other friends (who are both Chinese too?). Seriously, though, this friend is annoying me, and I don't even know if she's a true friend or not, and if not, how to tell her that she seriously annoys me and that I don't like her.

-releases deep breath-

Thank you all for listening to this middle-school girl's blunt, perhaps hypocritical, and overall, bad rant. Please give me some advice?