Shyness or Social Anxiety?

Tonight, I'm going to a holiday dinner for work. I only work with 3 other people. Only a few others we do business with were invited. There are like, 15 people max. I've been working there for almost 3 years.

But, I'm nervous. Incredibly nervous.

Plus, since I'm single I'll obviously be arriving alone. Arriving places alone is one of those shy things that makes my stomach a bit queasy.

This would be so much easier if I had a boyfriend. Or fiance. Or husband. But I don't. So oh well.

I leave in an hour. The feeling of distress starts now.

"When the conversation stops and we’re facing our defeat
I’ll be next to you and you’ll be right there next to me
Then I’ll say
Girl,if you’re wondering if I want you to (I want you to)
I want you to (I want you to)
I swear it’s true (swear it's true) "
-Weezer