I actually get a pretty good seal with adjustable ear loops. I have a 2-layer cloth mask with a PM2.5 filter insert. When I breathe, the mask goes in and out around my mouth, similar to what I see with the people using the N95 masks, and I don't notice anything escaping from the sides.
When it was real bad last winter, before I got vaccinated, I double masked.
I basically only mask indoor or outdoors if it started getting crowded, or any place where it's required.
Anyway, the point of the mask isn't to make a perfect seal or filter out every virus particle, it's to reduce how far the aerosol droplets that contain the virus particles spread. So if a little aerosol gets out and hangs around right around your head, that's a lot safer than no mask and the aerosol cloud spreading 6, 8,15 feet or more. And combined with proper ventilation and air circulation, those smaller aerosol clouds can be dissipated even more, further reducing the risk.