My family is so bad to me, I feel so sad and lonely...?

[Liana]

I am a 14 yr old girl. I have an elder sister and my parents in my family. My family is really rude to me and doesn't bother about me at all. I get A+ great and am always the topper but I am a little fat. So they make fun of me for that. No one values my opinions. My dad is always rude to me and talks sweetly only when he wants me to do some of his work. My sister is NEVER sweet to me. My mother acts really nice to me sometimes and sometimes she scolds me for no reason at all. My parents are really partial. You can actually see that if you come to my house. My sister has got an iphone, a laptop, an mp3 player, guitar etc.etc.etc. I don't have any electronics of my own. I don't really need electronics but I still get hurt when they do so much for my sister but nothing for me. They keep telling that my sister is so beautiful and I should have been like her. They keep criticizing me. When my family was about to get a new dog, I, being really interested in dogs and knowing a lot about them, suggested them a few breeds that would be perfect for our lifestyle and get on with my Labrador. When I suggested some breeds, my sister said, "Did we ask your opinion?" And my mother said, "You've got your own dog, right? Go and take care of it, don't interfere in our business." Then the new dog came, my mum stopped buying food for my dog (she is 2 & 1/2 yrs old). I am currently buying her food through the money I get for my part-time job of walking the neighbor's dog. I feel so alone and sad and am living just for the sake of my dog because I know that if I suicide or anything, no one will take care of her and she'll probably die). I used to have a really nice group of friends but my dad got transferred and now I have no one at my new school. I feel really alone and sad. My parents don't ever care about me. They go for outings leaving me to take care of the dogs. I developed this problem 'trichotillomania', a hair pulling obsessive compulsive disorder. Now my family makes me feel ashamed for that. My sister calls me psycho and my parents laugh along with her. When I tell them that it hurts me they say that my sister is just joking and then they give me a lecture on how I take things too seriously and am too sensitive and blablabla. I feel really sad and lonely. I want to die but can't. What can I do to feel better? Please help!