I am going to tell my whole sad story and hopefully feel better, maybe everybody tells me what a bad person I am and then I can at least kill myself...

Anyway about two years ago I started dating this girl, everything went well, my dad died the previous year and the emotional support was a warm welcome. About three months into our relationship I realize that the girls is having relationship issues with her mom, her dad doesn't stay at home with them and doesn't want anything to do with the mother although he doesn't openly admit it. The girl also had what I would call a alcohol problem, she denies it and says I am just using it as an excuse. Every time we would go out she would get so trashed that she cant see straight, but she doesn't get tired and sleeps she stays awake and just fight with me about nonsense. She wouldn't allow me to sleep either and purposefully tried to bring the worst out in me... Anyway long story short a lot of drama ensued, every time I wanted to end the relationship she would cry and ask me for just one more chance. Then one night it was the same story, alcohol and she being unreasonable and really saying hurt full things to me, we where in car so I got out and started walking home, she wouldn't let me ago and in my rage I threw a stone at her car and it made a dent... Lots of trouble... then about 3 months ago the same situation, this time she shouted at me in my car and tried to jump out of the moving car, me being slightly drunk grabbed her arm and pulled over, I then slapped her with the back of my hand... It left a slight blue mark, not much but I really wanted to kill myself.

Am I a psychopath? Her parents call me names and says that I am a women abuser and a piece of trash. Me and the girl are still friends and if we hang out her parents would phone me and tell me that if I touch her they would make sure I go to jail. Her dad also threatens to break my legs and when ever I try to explain all he says is that I am a psychopathic lier and I need help.
I don't know what to think anymore, I feel bad about these incidents but on the other hand feel that the girls constant drinking and calling me nasty things and trying to make angry is partly if not wholly to blame...

If anybody read this any advice or an honest opinion would be greatly appreciated!!