Presentophobia

The presentation was finally over, but I just couldn't get over my fear of giving presentations in front of a crowd. My legs tremble and my speech gets very retarded. I have difficulty pronouncing words that I usually have no problems saying and many other screwups. The only good thing is that I managed to stretch the presentation to over 15 minutes when I didn't really prepare much for it. Nevertheless, I'm still quite ashamed of my inability to give a good presentation at this stage. How am I going to get into a R & D career when I cannot get my ideas across? Must sit down and re-think my career path again.