Wear a reliable mask, fitted properly and remove it properly.

Also, wear indirect or non-vented eye protection, or you're that gate on a road without a fence that the virus drives around.

Finally, think carefully about airborne persistent micro-droplets, fomites and personal sanitation.

Wearing a mask as a standard, non-healthcare working, citizen is about protecting everyone else.

You are right though, you should protect yourself too, as much as possible.