Jenny,
I was there with you. It's hard at first. And as far as worrying about getting out of school and not knowing anything...well, you're right, you won't know anything. That is my opinion. However, you will be prepared with the tools to learn, and learn you will, quickly. I learned more in my 2 weeks of "transition" than I did in all of nursing school. The first six weeks you are out of school you will learn 100X's what you learned in school. That is my "opinion" of course.
Don't worry, just keep passing. It doesn't matter if you pass by one, or if you pass by 10, as long as you pass.
My theory was "just keep stayin' alive!"