Let me tell you that your feelings are completely normal. I have been an RN for over 4 years now and there is still much that I do not know. I think you'll be ok, the new grads to worry about are the ones who are complacent and think that they "know it all" and don't ask questions. They usually fail.
There is a great book out there, written by a nurse called "Your First Year as a Nurse: making the transition from Total Novice to successful Professional" by Donna Wilk Cardillo, R.N. The ISBN number is 0-7615-333-8. I found it at Borders for $19.95.
I suggest that all new grads read this book as it will offer you tips and suggestions on surviving your first year as a nurse.
Good Luck,
Kelly