If i go to a doctor's office and stay an hour on the waiting room, is it necessary to take a shower to disinfect after ? i'm talking about covid precautions. or this is just as crazy as disinfecting the groceries? lol?

It is about the same. Wear a mask and social distance, wash your hands thoroughly, don't rub your eyes, nose, or mouth.

Agree with Dr. D. Wash your hands, wear a mask and practice distancing. Shower to disinfect is not needed. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get flu vaccine. Wish you good health!