Bullheaded wife/Covid

Ill never understand why a mask is useless for me, but works so well for everyone else.

It's obvious if you just get one virus you probably won't get quite as ill, and it will give your system a chance to react.
If you get a massive dose of virus from a sneeze right in your face let's say, you will get it quick and your system has no chance to react.
A while back on a CDC vid I believe, one of the pros had his mask on upside down and inside out.