I'm an outgoing and social dude but for some reason get incredibly nervous when giving presentations. My hands shake and my knees buckle and for the love of god, I can't seem to fix the problem.
For me, it helps to remind myself that pretty much nobody in any audience actually cares much about what the presenter is saying. Most of the nervousness is from worrying about how people will perceive you. In reality, they're checking their email.
That, and practice. I give speeches 3-4 times a year, to about 150-250 people per speech. each time it gets easier.
