I know how scary it can be. I was the kid who did all the work and only asked that they (my group) present it. I was very stressed over every single one of them but then I read a line in a poem,
"The woods would be very silent if no birds sang there except those that sang best."
I think it means as long as you use what you have, you should show it off! And about being afraid, fear is in all of us. Yes, even the ones who get up there and do great and never falter but I will let you in on a little secret, they are just as scared as you.