Be not ashamed of mistakes and thus make them crimes.
Occasionally, we all make mistakes. You'll say the wrong thing. You'll think of nothing to say, and later l'esprit d'escalier kicks in. I promise you, it doesn't matter.
These "mistakes" form the basis of greatness, invention and mastery. Your aim? Forgive yourself for any past mistakes, and conquer them! Take some classes, read some more posts, get out in the field, and do it again :D
In my early days of Day Game, I sucked! I'd approach, ask for directions, and try and hook from there. I was stuck! For all my confidence, I could not see the mistake I was making. I had to step back, return to my social circle, and observe... The key? Not the opener. Not the speech. The smile.
After a short break, I retried. I approach the same quality of sets, in the same location. I held conversations, kept it light hearted and completed by first Day Game #close.
At the moment, I'm writing a free downloadable guide for you guys on Social Circle game, and I'm working on a project of my own ;)