Are you a good singer? A benefit to your choir? Do they sound better with you there singing with them? <br />
If the answer is yes, then just take a few deep breaths and tell yourself that to stay away because you are nervous would be letting them down for selfish reasons. <br />
Are you aware that many great singers and stage actors actually get so nervous before a performance that they vomit before going on stage? Then the get it together and go out there and give a great performance. <br />
You can do this.
Go in there and support the team. That's what team work is all about; being there for each other.
Go, sing your heart out, and enjoy yourself.
Please, let me know how it goes when all is done.