What should I do , I have gone through a rough experience am I am sad ): what should I do?

Ok well I was about 10 when this happened, my mom and dad would ALWAYS get in fights, and some people know how that feels so help me. There fights sometimes will get into HUGE HUGE arguements over stupid things and so one day I was in the computer and I saw a document on verbal and physical abuse, I looked at it and read it. BAD CHOICE !! I found out that my dad has physically and verbally abused my mom , it hurt me so much ! I haven't told anyone about me reading it and I have held it in for a LONG time, well one night my mom came home and my mom and dad got in a stupid fight over my sister doing something, it then lead up to us pausing the movie we were watching, my dad saying everything was fine before she was home, and us having to leave the room, once I left the room (reluctently) I heard my dad say something in the attired tone ever and my mom scream...my mom then ran ton my room and we locked the door. I cried for probably a hour straight , so hard I was coughing because my mothers scream terrified me, so bad that later my dad came in and looked SO angry and my mom screaming at him (all in front of me at 10 -it was TO MUCH WAY TO MUCH FOR MY AGE) and then my father left. I later slept with my mom THT night learning THT my dad had put his hands around her neck. I now relive THT night all the time and it just..terrifies may and makes me think. Also my mother would drink achohol and one drink would get her drunk . I now kinda have no respect for either of them ( them not knowing WHY at all , they think I just have a attitude) I also have to live with the things I have read on the verbal and physical abuse paper she had written for their marriage consular (when they had gotten into a marriage problem so bad my dad moved out) . I always think of how much I have gone through and no ones knows and now I'm having problems with my friend , about me and her knowing each other for 9 years and she just met this guy a few months ago and she tells him everything and she says he is her closest friend and I am her best when I have known her for 9 years and she tells him more personal things. It all just upsets me, what should I do ?? ):