Dear Hopeful,
I am sorry you are in such tormoil. I think your T. is right, though. Try not to worry about what your store manager thinks as long as you are doing your job, then you have nothing to worry about.
As far as you thinking people will think you are stupid for not knowing where everything is, don't worry about that. It takes time to figure out where everything is after a remodel. Just take things slow and you will be OK.
Wishing you the best of luck!!
Linda