Oh.... Just read the rest!
Sounds like you did great! Don't be hard on yourself, it's not so easy performing for people. Great performers master making it look easy one way or the other. Your gonna get used to it.
IMHO, Playing just one song is the most difficult situation. Too much pressure to make it perfect. If you have a full set of 15 songs or so and gradually get more comfortable, by the last song you'll be ripping and that's all folks remember.