Its ok. My sister, Amber, had trust issues with some people but she leared how to open up and talk more easily. Believe me, there were times when she didn't even leave the house for almost three weeks straight. But remember, if your step-mother is that horrible to you, you have to tell someone who'll listen. Maybe they can help. I don't know if I helped or not but I tried. :D
I'm awfully sorry for all the shit you've gone through.