It'll be so amazing! You'll be there on stage, basking in the hooflights! The center of attention! A shining star! Everypony staring at you, judging you, jealously noting how they could be way better than you! Why wasn't it them? Why wasn't it them? And then, when you choke, they'll turn on you, becoming a seething, angry mob, and you'll be horribly humiliated, never able to show your face in Ponyville again!