I think one of the reasons this has been such a popular thread, is the way in which you have managed to convey your emotions in all of this (the self-doubt in particular). Most of us can empathise, as at some point in our lives we would have experienced similar feelings to a lesser or greater degree, obviously not related to being a stand-up comedian, but... job interview, that first date and what to say, etc.
Anyway, good luck!