It is called, "Doing it." Over and over. You can't pull it together without repition. Make sure you rehearse quite a bit.

First of all, if it is something new, rehearse it with the lyrics where you can see them. Then the second time through, push the lyrics away from you farther. The third time, make them where it is very hard to see them, so you force your memory to work harder. Rehearse three times a day for a week before you perform.

If you can videotape yourself, do so. Place the camera about 15-20 feet back so it is as if the audience from a few rows back can see you. See if you enunciate the lyrics, play with dynamics and are understood.

Get on some open mics and take the pressure off of yourself.

Don't totally close your eyes all the time. If you have a microphone, focus on the end of it instead of looking at the crowd. If you look at the crowd, look above people's heads, or in between two people. That way it seems like you are looking them right in the eye where in reality you are looking between them or over them.

Past that, it is just a fear you have to face.

MAB