What to do when i find that my roommate is not a real woman,she was caught wearing fake silicon boobs .?

There is nothing shocking about it. She underwent the sex change operation on her own. Let her lead her own life. If you have control of the room you can tell her to leave or find yourself another room with a decent roommate. Maybe, you find the matter disgusting, but that is the way things are in real life. She wont be of any harm to you, but your self respect will take a beating if the matter becomes public.