flippa
Player Valuation: £750k
This is a very good way of looking at things, as is the flip side of this advice, i.e. "will anyone care about this in 2 weeks"?
If the answer is no, then don't waste time worrying about it.
And to add to that, when afraid of making a fool of yourself in public- "do I know any of these people? Will I ever see them again?" is also good.