At the risk of sounding ambivalent... It does get easier AND it doesn't.
I think the thing that gets easier is that you learn how to cope with the nervousness. I had a theatre prof who told us that she used to vomit before ever single show she was in. She stopped vomiting, but she still got visibly nervous. She came to the conclusion that if she was nervous it was because she was so eager to do a good job. Eagerness is not a bad thing, eh?

I think that if you have an innate nervousness performing in front of people that may not change, but you can train yourself to channel that nervousness into energy for your performance.

Buck up. You'll do great!