My family makes me feel like I'm worthless.?

I'm 15 years old girl, and am 5'1 and 128lbs, although some of it is muscle. I do pretty well academically and musically, I love to write stories and I am happy with my friends. But my family makes me so sad. I have three brothers and they never include me and make me always feel like the outsider. My Mom is constantly criticizing me, and comparing me to my friends, even when I think I've done well she finds someone who's been better. Lately, she has constantly said that I'm fat and that I eat too much junk food. It got to the point where I didn't want to be at home. So I went for a really long walk yesterday, but when I came back my Dad was really angry. I had a bag of old candy wrappers in my room that had accumulated, and he was mad at me for a) eating in my room (which I knew I wasn't allowed to and did apologize for, but that's about as bad as I get), and for b) eating the stuff at all. I told him that I didn't eat it all at once, but he didn't believe me and told me I looked like crap. I told him I wouldn't apologize for eating it but he pushed me against the wall and started screaming at me then sent me to my room. Afterwards he came up and acted so superior and told me basically what a great dad he was. After he left, I cried till my eyes hurt, cause I can't feel good about myself with him. I don't want to run away cause that wouldn't fix anything, and its not like he's abusive or anything, but I don't want to come after school anymore. I know this doesn't seem like a big problem but its making me feel worthless and unhappy. Any advice?