I havent been on TV, but i had to speak at audiences a few times and i guess its the same. With some of us its just natural. We just don't care and seem very confident. I don't know how to directly help you except to say that you shouldn't worry about anything and stay as cool as possible and concentrate on what you are doing. I don't know if it helps, but it's the best thing i can think of, there is really no secret in speaking to people, its a skill like any other, and some learn it easy and some learn it hard. So just take your mind off of the worries and concentrate on your job. Maybe in my case is my ability not to care if i make a fool of my self. I know its hard for most people, but not caring what others think to some extend gives people great confidence it the way they act. Its normal, stage fever is a natural break mechanism and overcoming it might be hard. Maybe if you think of your self as a successful person(Im on TV, that means im cool) you will act cool and calm. I don't know, i never thought of it seriously till this moment. Hope i didn't confuse you even more.