I need advice,please help me.?

I'm a girl (16) and idk if this is just a teenage thing but i feel alone.first off,my mom knows i'm weight sensitive(i'm not the skinniest girl in the world or the tallest)&she's allways commenting on it.she say"Are you gonna wear thoes jeans?,your but looks big"i don't really talk much but my step dad always trashes me unfairly evreytime i get in a argument with my little brother even when it's 100% his fault (he favors him,its his son)i Have my limits and i eventualy blow up & talk back.my mom gets mad & calls me a "stupid short bi*ch"& says i'm jealous bec.i don't have a father like my bro.it's not true,i'm glad he has a father figure in his life bec. i never did but he is unfair & if i dn't defend myself no one else will. i have no one in my side.i hate my stepdad for being such an as*,i hate my real dad for never being there for me,i just don't like men overall.i hate my mom for not understanding me and being so mean& i hate myself for hating her.idk what im asking for i just need advise.