Someone please tell me what to do..?

i had enough of my life...my mom yells at me whenever something doesn't go as planned..... i end up crying and she tells me to shut the **** up cause its not going to work..i try to tell her to stop and she calls that back talking.... i have a brother who is literally killing me by giving me high blood pressure.....my sister is the one causing me stress cause since my mom and dad divorced im her little back up dad....i am trying to maintain my school but i have to watch these lilttle kids while my mom gets back from work..... the computer is the only thing to keep me happy and calm......whenever i am using the computer my mom yells at me to get off.... right now just because i told my mom to please stop yelling at me my dad is taking the computer away till my next birthday..... i have so much bottled up emotions that i need to scream so loud.....i want to live with someone else...grandparents are out of the question cause their siding with mother and father.....aunts and uncles as well....cousins are to young......i started fresh at school so friends are out of the questinon.....all of this stress im going under is only for an adult and im only 15 and i am breaking down to the point of suicidal thoughts.....i am trying to beg my dad not to take it but he tells me to shut the **** up and that i deserve it...I ONLY TOLD MY MOM TO STOP TALKING TO ME ALL RUDELY!.....please help...my mom calls me names most of the time......my brother just likes to annoy me and my sister just needs guidance.....i want to end this once and for all...i have thoughts that i dont have a reason of why i'm living...why did god put me through this mess.....please help me i had enough of this please answer my cry for help....