I feel like I'm going insane?

Me and my mom constantly argue about everything. It hurts when we argue because she always resorts to calling me fat, stupid, idiot, lazy and she tells me that I cause all her problems, and if we argue in front of her husband or my brother, they join her, they make fun of me and defend her without even knowing about the problem, and then when I try to fight back to get them to leave me alone, everyone thinks I become a devil child.

And I can't help but agree with them…

There are so many problems with my family, my parents are divorced and then my moms husband beat up my dad because he tries to visit me, I hate my moms husband, but I can't help but talk and smile at him, because I only see him as a credit card. My mom buys me stuff I want, I mean heck, I'm using an iPhone 5 to type this. I feel like I'm going insane, I only talk to him because I want money, yet I hope he rots in hell, and then my brother and mother constantly make me feel bad, they both call me fat, ugly, lazy, worthless and then my brother has told me before that I'm stupid because I'm fat and that no one will love me. I'm jealous of my brother, he is a teacher, getting married, and is making money off of what he loves and has been on the news because of how good he teaches. I'm upset because the older I get the more I realize that the chances of me becoming popular and rich off of art is slim, and everyday I think about how when I grow up I will be in debt from college, I won't have a good job, and that no one will ever love me because of how stupid and ugly I'm. For the past week everything has gotten worse, me and my brother haven't talked since Sunday, because everyone wanted to leave town and I was changing clothes to get ready, they told me I was slow, they called me slow and said I like a beached whale (which is basically their nicknamed for me).

The thing is, is that I'm 50 pounds overweight, and everytime I try to impress and lose weight, they laugh, I give up and then i gain it back

Added (1). I actually do see my dad, I go to his house about twice a week.

Let me tell you something: Family is important no matter how screwed up they are. Even if they call you names, just role with it or ignore them, they will be surprised. About your dad: You should meet him in secret. For example: text or call him and say you want to meet for tea at a cafe like Starbucks and don't tell anyone keep it to yourself, no one has to know because no matter what he will ALWAYS be your father and NO ONE can keep you from seeing him. About your weight: go and see a nutritionist, TRUST ME they help and motivate you! About your dream and job: you don't have to get your dream job but you can do something else like teach kids or teens about art in a school or you could work in an art school. About your family: PROVE THEM WRONG BY TURNING YOUR LIFE AROUND AND THEY WILL HAVE MORE RESPECT FOR YOU AND THEN THEY WILL BE EMBARRASSED THAT THEY EVEN CALLED YOU NAMES.

And lastly: DON'T GIVE UP!

If they give you all the money you want, get lipo and have them get you your own place