The very first time I performed on the "streets" (a.k.a. in my high school hallway) I did screw up. But that didnt stop me! I just kept on performing for people I know until I can do something without even thinking. Oh, and even if you do screw up on the streets, it doesn't matter. So what if you screw up in front of total strangers? There just STRANGERS!!!!! What are the chances of you seeing them again? If you want to go out and perform, GO OUT AND PERFORM! If you don't, then don't. You just have to ask yourself: Am I ready?