Can someone please help me?

Hey, I'm 15 years old, I am currently living in new zealand, moved over from england back in about 2005. Turn 16 in rougly 2 weeks. Im not at school at the moment, I was expelled from my first school, after reptetitive things such as drinking, and organising fights, also being onvolved in fights myself. My expulsion included me spraypainting aroudn teh school, and vandalising it, in which i was caught on camera. I decided i would go to a private school, that didnt work, as i eneded up after 2 suspensions being removed 4 weeks before the end of the 2nd term. My parents had a bad split up a few years ago which hurt me alot, dad got another chick pregnant, Mum has a severe drinking problem. She has lost custody with me, but i still go into her house for dinner. I dont have a license, but have been driving her car alot, In which dad found out and was very angry. I am into marijuana, and sell it to keep a bit of money in my pocket. I have a beautiful girlfriend who i love heaps, But i am very very nervous about her.. I always think she is going to cheat on me or lose me. At the moment, i ahve seen about 4 psychologists, Who have diagnosed me with adhd. I am going through that process atm. I have two bros. one who is my twin. I have had a few run ins with police, one vandalism down a road, two, theft and vandalism at a public school, and public scenes of intoxication. I am very easily angered. Which is not good. I loste my temper at almost anything uneasy, Especially when someone coments my mum on her drinking. Or my position of not being able to be in school, Im also called a retard alot, as people believe me to be stupid. Which I am not. I get sad alot, I cry to myself, I dont want to be like what I am. I dont know whtas wrong with me, What makes me lose my temper, I cant concentrate on anything, I used to be a very very good fooballer, but these days i just dont like it. I cant be bothered playing it. I like boxing, But making the commitment of having to go heaps is not good, and i cant commit to such a thing. I always argue with dad, i know he tries to help me all the time, but i jsust get angery at him, I swear alot, I keep to myself around the house, and if my borhters annoy me, i lose it. I hate when people change their tone of voice around me. It ticks me off. Everyone thinks i have adhd severely, But im not sure i do. I dont like my life at the moment. Its just sadness, I spend alot of time with my girflriend. Im happy with her, But as soon as she leave im filled with sorrow, And i cause arguments over texting, about my lack of trust (which i have no right to have) in her.. I have friends, Which are all into drugs, My dad hates them, So much.. And I always end up having to sneak to their houses, He see's something good in me, I want to see good but i just acnt, Its starting to get to a point where i just wanna f*** off. Have nothing to do with anyone. Sorry if i sound like im having a ***** and moan, but i seriously dont know what im upto. Im jsut heading towards prison or an alcohol dependency like my mum :( I dont want that, She has had many drink driving charges, she says shes gona quit, but i always find her drunnk in her room, Its sucks seeing that. My dad is with the girl who he cheated on for 3 years. I hate her. I hate them together. When they go out with my brothers, i would sit by myself somewhere. I love music. Mainly rap, Or something easy like the script or one republic. But yeah.. If anyone has any tips or anything.. Please help.. :(