Terrified

I'm starting a new job in a little over a week. I've been so excited, because it's an amazing opportunity. I was a high school math teacher, but I'm becoming a college math professor. This week, though, it's hit me. I don't really know how to do this! Everyone that I slightly confide in tells me, you'll do fine...everyone will love you. The thing is, I have always thought that people think more highly of me as a teacher than they should and sooner or later, they're all going to find out that I'm not as good as they think I am. That's what keeps running through my head. How am I going to teach these classes? I wish I could just observe them for awhile before being thrown into the mix. But, no such luck. Guess I just have buck up and face my terror head-on!