Serious problem involving transexuality, parents, and the computer?

My parents ground me from the computer Alot. It's been their scapegoat for years. I don't do good on a test? Damn computer. We have an argument? Too much time on the damn computer. They believe I'm addicted to it, while the truth is much different. I'm transexual, and the computer is how I let out the femininity. I'm a woman on there, and it feels damn good. It's my only escape from my life, and I cherish every moment of it. But recently, they've been grounding me for EVERYTHING. And it's really starting to screw with my life. I'm getting depressed, and the woman that I normally hide is starting to show through. My question is: how do I convince them to stop grounding me, short of coming out. Coming out isn't an option. They would just beat the word of Jesus Christ into me, or send me to all sorts of psychologists and straight camps.