Everybody has nerves - even some of the most hardened pro musicians.
My first public performance was an absolute nightmare and for years I used to get so nervous my nose would run almost continuously while I was onstage!! Not pleasant!
Even now, I find that the more technically tricky things I want to play, sometimes I can't when I'm onstage. I can play no problem at home or rehearsals but the added nervous energy when onstage just makes my fingers tense up.
So I always end up keeping things as simple as possible and usually get through without any glitches.
Mistakes will happen, that's a fact of life. Just don't get hung up on them.