Nervous can be a positive thing. If it keeps you focused, you're more likely be at your best, IMO that is. I hope your debut gig went well. Just remember, there are lots of dreamers and would-be artists out there who don't have the bottle to play/sing to a live audience. Many will envy or admire you just for being brave enough to get up there and do your thing. In their envy, some of them will inevitably be your critics. Even some of the most seasoned veterans get a case of the nerves before a show. Remember also that you can't please everybody, so just do what you do (whatever THAT is????????), and give it your best. Go with the flow and roll with the punches. Good luck in future ventures.   

S