Just relax. The thing with public speaking is that it takes practice. The more you do it the better you will get. I have been lucky enough to have been encouraged to public speak at a young age. I still get a little nervous before. But once I get into it, it just comes natural.
SeeGeeWhy covered most of the points. Also try not to talk to fast. That is one thing that I used to have to concentrate on. If your really worried about it. Video yourself and see for yourself what you need to work on or change. ie hand placement, talking too fast, oohing and aahhhing. Things of that nature.
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