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Masks are dependent not upon you wearing one but on those around you doing soooo......
This. A properly fitting N95 will protect you from the virus. Most people don't get fit tested for these, or have had to use a different model that doesn't fit as well due to shortages. If it's not a perfect fit, then you can still get infection.
Surgical masks, cloth masks, bandanas and the like are only useful if everything is using them. The catch the brunt of the coughing/sneezing force of air and the water droplets. They also catch the spit that flies when people talk, yell or sing. They don't block all of the already airborne viruses. So if you are the only person in a crowd using a mask, it's not going to help you. If everyone is using one, then it makes a big difference.
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