Hi Erika - It's absolutely natural to be nervous, especially when making a big life change.
My son, Sean (spook22), left for BC 3 days before his 19th birthday. He'd never been away from home either. He left his family and girlfriend behind (Amanda - who is now in BC), and never looked back. I think they keep you so busy, that there's not much time to think about home.
He just graduated on July 17th. He's made some good friends in BC, and is currently doing well in Pensacola.
We are all here to support you thru this. The support from this site really helped Sean (and me). You can do this!! Just keep in mind all of the wonderful opportunities the Navy has to offer you.
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