I am at breaking point and don't know what to do :(?

well at school i am realy nice to people after what happened when i lost all my friends and today they're all throwing it all back in my face after all i done for them and my dad blames me for absolutely every bad thing that happens in his world and he just this minute hit me for making his game shut down wen i did absolutely nothin i tryed talkin to my mom about it but she started going on about how hard her life is and i cant talk to my dad about anything because he just mumbles pooh at me when i do! i try talkin to me friends but i havr fallen out with them and i tryed talkin to my new friends but i just dont feel part of them yet and my gran and grandad just critisize me on everything and think i am frigging accusing god for my life!they're gay and i am just stuck with everything and i just got told in one of my favourite lesson that i aint doing things properly when i worked my *** off for the whole of the work and i just feel useless