Decide for yourself if a mask helps. Look at this picture of a cough.

Only the mask on the coughing and sneezing person is the mask that makes a difference..  The photo (with special lighting) of a cough makes it plain.    My takeaway:  Medical people want masks because they are up close to sick people.   Coughing and sneezing people protect their neighbours by wearing a mask but should be at home.  Healthy people who aren't coughing and sneezing and standing right up close to other people probably don't need a mask.  To put one on is kabuki theatre.