Any job worth a paycheck cannot be learned in five days or less. You're not going to get everything right away, and they understand. Comparing yourself to people who have been doing the job for years is going to get you nowhere; quit doing it. You're not perfect, you will never be perfect, so quit feeling guilty if you don't end the day perfectly. You ended the day pretty darned well all things considered. So dust yourself off and move on.
Your overwhelming desire to do it right and to be liked and be the best is going to burn you out before you even get started. Relax and enjoy it a bit, will you?
Slow down, you'll be okay.
The Rational Side You Never Listen To