shouldbesleeping,
Its not difficult to be coerced into sex when you don't want it when you're in a relationship such as yours. She has a sense of control over you and she knows it. I understand you are in the military and going to be released in about 4 months. I know its a BIG stigma in the military but I would recommend an appointment to the mental health folks and talk to a counselor before getting out. Use your barracks room whenever you need to get away. There needs to come a point when you stick up for yourself and realize enough is enough. Abuse should not be tolerated, especially if it is physical. And when she comes on to you, call someone or go somewhere where the urge isn't so great.