Dealing with rude family?

Okay. So. I'm 19. Well going to be soon. And I have an incredibly rude family. I'm not quite sure how to explain it. I mean I can be rude back but I'd rather not. So I got up this morning Well this afternoon. I had a LOT of trouble staying asleep last night. Anyway. I got up this afternoon and I went downstairs. My moms first reaction was, "Awww great Erika is up." And then the rest of my siblings chimed in, "Oh great". They weren't cheering or glad that I was awake. They then started mimicking me and these awful voices every time I would say ANYTHING. I'm soo frustrated. Hell my mom even forgot my birthday this year. And every time I mention anything about her saying anything to me in a rude way, or using me as a bad example. She automatically says I'm just being melodramatic. OH! and she's always telling me little sister if she doesn't watch her weight, she'll end up fat like me. I'm not fat. I hate when she says I'm fat. I've pointed out to her plenty of times that I'm VERY very happy with my weight. A solid 130. Its not super light but its a healthy weight for a young mexican american woman. She always like to pawn things off as me being the 'troubled' child as well. She holds things against me. I hate it. there are times when we get along great! But the days where she treats me like an outcast outweigh the days where she treats me like an actual human being. Don't get me wrong. I love her. soooo much. And I don't know what I would do if anything ever happened to her. I just hate how rude she can be. Whoo... Okay. So now my question is, how do I deal with that? With all that she's been doing to me?