Being abused, don't know what to do?

OK so I have been abused all my life :( and I feel like I can't take anymore. My parents are divorced, and both are really not fit to be parents if you know what I mean. They are both very depressed, my mom even tried to kill herself last year. They are completely crazy and my dad treats me like a slave all the time and hits me if I don't do what he says. They act as though all of this is my fault and what they are doing isn't wrong at all :( So I am always blaming myself for everything going on. I have always just bottled up my emotions and tried to pretend that everything is okay but now things are starting to fall apart. I finally told one of my best friend's this year after I came to school and I was just a mess after my dad had beat me up the night before. All of my teachers at school seem suspicious even though they haven't done anything about it. My counsellor said that a lot of teachers have been concerned about me. I usually am able to cover up bruises pretty well but it's getting ridiculous. Should I tell someone what's going on :( and let CFS deal with it? I can't help myself from thinking it's not that bad but my best friends keep reminding me that it is really serious and I am just too used to it that I don't notice anymore. I am already almost 17, Should I just stick it out for another year? :( ADVICE PLEASE :( I really don't know what to do anymore :( I am scared that they will hurt me if they find out I told somebody.