why is my life getting worse?

I'm just so messed up right now everything around is going bad i don't what to do anymore i'm so frustrated and angry right now! so in school my teacher knows i don't eat too much i'm kinda scared to be fat i used to fat then i lost weight don't want my teacher to know or anyone !!! . i sometimes when i don't feel like eating now my teacher might think i'm insane or something i'm so scared i just want him to leave him alone it's so embarrassing he's telling my dad! :( today he told my dad everything about him that in school i don't take my jacket of he never asked that he asked that the first day of school! i din't want to didn't feel like it. he tells him i don't talk i'm always quiet and i don't sing when we are singing i'm afraid of singing in front of people. i'm afraid teacher thinks i'm sad and miserable now my mom and dad know my mom and dad always moans about it about my dad and yells :( i cry when it happens this happened today she called me crazy she said ' you crazy you don't take your jacket of you don't eat you're very crazy' she yells at me i just want to hide run away! she told my dad to hit me and pull my ears and my hair :( my brother screams at me too calls me crazy my sister too everyone is against me everyone hates me my mom never talks to me i don't want to be around her she so scary and she might hit me. i just want a happy family that are not angry at me :( i feel so stupid my mom sometimes tries to hit and then i just go to my room she said i'm so stupid i'm causing her problem that point i feel like i want to die see what i'm doing to my own mother :( she always yells moans she screams at me real loud. no one loves me ;( my dad said ' stop being like this just stop' i get so embarrassed i wish he didn't knew i am sad maybe i'm the problem? my life is so boring nothing is fun going to the park is boring nothing is fun i know it sounds like i'm lazy i'm not nothing is not fun anymore i just like everything is falling apart i'm not that girl anymore who loved herself and always happy and i din't have any friends. but now i realized i'm a loner no friends no one notices me at school 2 days ago at school this girl so be alone at the playground i've been a loner for a really long years it makes me so sad so she called me over to the girls the girl told the girls that i'm hanging out with them one of the girls said ' i don't care' i'm so invisible no one notices me they don't like me :( i'm so alone i try to help myself to be happy more i don't want to do i'm afraid of eating i might get faint i do get dizzy most of the times. my family being so mean to me i can hear them talking about me making fun of me i just feel like falling of a roof just to stop this! i don't want to here anymore in the world anymore!! i'm so angry i don't what to do anymore i don't want to tell anyone i know some of you say ' get friends try to be happy blah blah' i don't know what to do i want to be like a happy 13 year old i see a lot of my age so happy! makes me so sad i feel so dead seriously i try to help myself but i don't want to do what the point of living not wasting my life living this way! sometimes i can't sleep at night i worry about things i'm so messed up i'm in room being sad all the time worrying. all i want is to be dead it be better everyone don't have to stress over me anymore i feel like i'm so anoying to people i know you will be helpful and stuff but i try to take your advice but i don't what to do ?