Auditioning for community theatre?

Lots of exposition here:

Last year, I moved from a small town in the Midwest to go to school in LA to study acting. I found myself totally overwhelmed there, and retreated into myself (barely talked to anyone, spent too much time in my room, etc). Since then, I've taken a year off of school and moved back home. I know now that I did this out of cowardice.

I initially planned to get a job and my own apartment while I was here. Then my mom got cancer, and I stayed at home to help (although I was somewhat relieved, since I was scared of living alone). I do have a part-time job with a start-up company, but otherwise I have nothing to occupy my time. I have become even more socially reserved, and I've spent almost all my time in my room (this is due to embarrassment at not having my life together). I am now awkward and terrible at talking to people. I just have zero confidence in myself.

I recently got an invitation to audition for a community play ("Oklahoma!") in my town. I know that I'll get a good role if I try out (I may be awkward, but I'm an awesome actor/singer), but it wouldn't be a new experience, I've done community theatre before. Then again, it's been a long time since I've actually done a play, and it might help me recover confidence. Should I look for auditions at a professional theatre?

So my question has two parts. Is it normal to have spent so much time apart from people, feeling ashamed and afraid?

And should I do this play to feel more confident, or should I charge into a new experience?