The butterflies in the stomach...The sweaty palms...The tightness in your throat...The weakness you feel...It's all part of being nervous before you go on stage. This is exactly how you should feel before a performance.
The nervousness you feel before the show is 100% normal. As a matter of fact, this is exactly how you are supposed to feel. If you were not nervous it would mean that you no longer care. Everyone gets the same feelings but it's all in how you deal with it. You have the opportunity to change those feeling into excitement. Being nervous does not mean you lack talent and it is not a sign that you should give up and go home. It is a chance. It is a chance to switch from FLIGHT to FIGHT and go out there and perform your ass off!