Emancipation: Getting an Emancipation

My step dad tries to control my life. My mom married him when I was 6 and ever since he has been trying to control my life. When I was 7 I started getting migrains that were caused by stress and lack of sleep and I think my stress is because my step dad. He is the biggest jerk I've ever met. I still am in contact with my real dad and my mom is always yelling at me about him because my real dad will not talk to her so I'm in the middle and my step dad tries to get involved too. My step dad is always yelling about me to my mother and he thinks that he's just looking out for me and I think he's just a jerk and is causing me stress on me. I want to get emancipated but I doubt my step dad will let my mom sign the paper. What should I do?