Controlling parents

I'm 15, and I recently just moved in with my dad and step mom. I haven't always had the best relationship with them. They've both always kind of been verbally, sometimes almost physically abusive. Well after 3 years of not talking to them a lot, I moved in with them for school reasons. 
 I'm doing great in school. I'm in the play, I'm involved in 3 athletics and church. It makes me busy all week, so on the weekends I want to spend time with my grandparents (who I'm really close with) and friends. It no big deal. But my dad get extremely obsessive and psycho. He's always wondering what I'm doing, where I'm at, who I'm with and exactly what time everything is. He yells at me a lot of I'm a little late, or if I don't know what time everything will end. It's really starting to scare me, and I'm afraid to talk now. What should I do?!