Yea Curl i agree with former frens comment. I use to have and still have same problem up to some extent. when i first prepare for my presentation i almost ruin whole thing because of fear. Then i took speech class...called  Public Speaking in which all you do is go to class talk infront and listen to others, That class really helped me a lot but still my leg shakes when i stand in front and my ear turns red and my tounge slips often but i think i am little bit more confident than before so yea....practice would be a major way to improve confident.

Best of Luck