I think everyone experiences stage fright to a certain degree. Some less, some more - but everybody did at one point or another. What I can assure you will help, is to get your performance material down to perfection. Even Oli Herbert from All That Remains used to practice his songs all the way from insanely low BPMs up to over 20% higher than what it's supposed to be played at - for hours on end!

Once you're completely comfortable with what you're playing, and muscle memory kicks in, it gets easier - trust me. You'll feel more free to do a lot more on stage, like a weight has been lifted off your shoulders.

if you've already got that down and it's still happening, sometimes only time and experience helps. The more used you get to performing live, the more comfortable you'll be.

Just a question though, what instrument are you playing? Or are you a vocalist?