What is wrong with our relationship?

Hi everyone, Sorry if there is poor grammar, but I’m typing on my ipod touch. Anyway, my father and I have a horrible relationship. He was never around as I was growing up, up until about age 12 (I’m 15 now). He was always working on call for a local cable company and sometimes was called in during family vacations, etc.

Now that I am almost 16, everything has changed. If I try to talk to him in a normal tone, he yells at me and says that I always have an attitude with him. If I ask him what he’s doing, he yells at me claiming the same thing. I have no idea how one can have an attitude with normal tone, do you?

The only reason I stay at my house at this point is because of my mother and my little sister. I want to protect them from his anger problems, but I just can’t do it anymore. It has affected my schoolwork (I’m an a student, and I barely passed my history class second semester), my sleep ( I can hear him throw stuff, slamming things, etc), and my mental health ( I’m bi-polar, and I have to manage this without the use of medication, which is very hard.).

At this point, I have given up on getting any closer to him because it is just a waste of my time. However, what can I say to him to make him get the point that he is being a complete jerk towards me? Where do I go from here? I’ve already got half my stuff packed and sitting at the door, so hopefully some good advice will come soon.

Thanks to all!