Take heart! Any new job takes time to adjust. I have worked in the PACU for some time. When I change locations to a different hospital, the routine is different, the paper work is different, and the people are different from what you've had before.
Most new grads feel overwhelmed. You're still building on your foundation. Even it you feel that you're on your preceptor's last nerve, ask questions if you're unsure of anything.
We have students come into our unit where I work. Sometimes RN's think they were born with a license, but we need to remember that we were there once too. Keep trying and you'll love it. Most people who work in surgery wouldn't want to work anywhere else. If, after a year or so, you find that it's not for you, you can find something else.