??HELP PLEASE sgshksgsagjl?

in primary i was skinny but happy and good and clever in all subjects.im in year 8 now and i have started getting into all sorts of things e.g stealing knives & phones & money and bullying people, jumping out of school etc.i punch people really hard if they annoy me or anything i don't bully no more but i steal more, i was never violent in yr 6.i have got excluded once in yr 8 and all my grades are going down except maths and art and I.T in all the other subjects im underachieving i was good at all this stuff at the beginning of year 7. im doing my maths next year (a year early). i lash out at people and i especially hate my parents once my mum said my nan thought she never had the problem but i did i know my nan was right and i had a problem but i cut up everything with her name on it with a stolen craft knife and i sat in my room till really late at night with the light off cursing my family and wishing them all dead.i get 7 to 5 1/2 hours sleep each day but i sleep like 12 hours at the weekend. i skip out on supper.im skinny i started my period then stopped for a few months then started now i have stopped. frustrating. i curse my mum and dad like everyday i absolutely HATE them.i used to speak properly and clearly (i used to live in some posh place but moved) but now i mumble, splutter and people sometimes don't know what im saying i always forget what im saying as well. have i got A behaviour problem? depression? stressed? i have had numerous body problems as well, keep on being sick, infected toes wart on my leg. i eat fatty food everyday i have burger and chips like 2 times a week but i never get fat and crisps and 2 chocolates on the other days? AH AHA TWF HELP i just spent ages typing this out and giving you most of the details so please help me thanks :)