Gaining respect?

Ever since I was 13 my life has been full of heartaches and headaches. My mother was diagnosed with liver disease and For 5 years I did everything I could to take care of her and my two year old younger little sister. My mother recently ped away on 04/26/06. I was a momma's boy and all i wanted to do was make her happy. We then went to live with my grandmother and she ped away two weeks ago. The only two ladies that have taken care of me in my life are now gone. My father was in prison for seven years and was released about two years ago. I know he tries, but he doesn't really know how to be a dad. I get "hell" on just about everything. From moving a pen to blaming me for everything even his own problems. I don't know what he expects from me. I recieved a full-ride to Texas Tech University and just recently finished my first year and am now in my first summer session. My grades are good. I also work 40+ hours a week. My life has been hell. What can I do to get him off my back?