Fear of becoming a female

I'm a 19 years old male. Since childhood I have a fear of becoming a female. Though I know that it is impossible because I'm a male and have always identified myself as a male. I have never wanted to
be a female and have always hated the idea of doing any kind of girlish activity.

Not always but sometimes I feel like a girl has kicked me out of my body and entered into it which is disgusting. I am afraid to sleep at night because whenever I go to sleep I question myself, "What will happen if I woke up as a girl?"

I think this is OCD which has become very much tourchering. I feel depressed and cannot concentrate on anything.

What do you all say?