While you might see mixed messages in the media even a cursory review of research papers makes it clear that you should:
Wear a mask to help stop the spread of Covid19!!!
The reasons for wearing a mask are:
• The mask acts as a barrier to droplets passing between one person and another.
• The mask prevents the wearer from touching their nose and mouth
• The lower the dose (inoculum) of virus which you might be exposed to by wearing a mask, the better chance your body can mount a defence
• The mask is a visible signal to others that virus transmission prevention is a priority and is becoming a social norm in the current circumstances.