Too shy to join my school volleyball team?

So the school year just began and there was volleyball tryouts a few weeks ago. Deep down I know I would have been good enough to make it, but I didn't even try out. I was just too shy to go to the tryout. Generally, I don't have a lot of self confidence, and I'm always afraid of doing or saying the wrong thing. But all my friends have been asking me why I didn't try out, so I just say I'm not good at volleyball. But most of them know I'm good and will respond with "Yes you are! You have a wicked serve!" Or something like that.

Now I really wish I could play but of course I'm not on the team, and I would have to wait till next year to join.

Why do I feel this way?

Why didn't I want to try out?

Any advice on how to get over this?
Too shy to join my school volleyball team?
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