You'll do fine - good luck, and remember you're doing something for you that will last the rest of your life.
The other thing? That's how most of us spend our lives. Welcome to our world. How you deal with that feeling is a measure of how well you'll do in life. Up until now, you've been more or less told or directed about what to do and how to act. Now, it's all you girl. And go get 'em! Oh, yes, and have fun!