Maybe rehearse your lines a lot. The more prepared you are the less nervous you might be. I remember in school we had to do a play once and our group was the worst.
Everyone was unprepared and the props were a mess. So between some scenes after the curtain closed we would take up to 5-10 mins to prepare for the next scene, while all other groups took a maximum of 30 seconds between scenes.
People were falling asleep during our play.
But I wasn't nervous because I remembered that they were people too and everyone messes up once in a while.
rofl, poor dat" & then after 3 days I would get a HUGE meltdown.