stage fright
well.. be thick-skinned if you're not. hehe! but remember that you're up there to entertain, get connected with them and give people a hellava gooood time.
and i used to do this too: look at the space behind the audiences first. once you feel comfortable, look at the audience. actually it's amazing to see the expressions on their faces. you'll see some of them smiling and some just starring straight at you, especially songs that you're directly giving them some kind of message.
mmm... those are my sec school experiences. i dunno about performing at gigs leyy. hehehehehehhe!
well... imagine if you were the audience, what would you expect from a performer?