Most likely you were just nervous.
Hey it happens to all of us from one time to another.
JUst remember the people that you are playing for aren't any better than you,
in order to be a proggresively better musican,you half to just deal with it.
You'll start to like it after a while.
I use to get "the shakes" when I was young,
but you learn to deal with it over time.
When attempting the impossible, you achieve the best possible