I don't for quite a while anymore, but I did longer than most others. I had to stop because people were laughing at me at that point as I was basically the only one.
I simply felt more comfortable with it. It felt good to have a large portion of my face covered, people not seeing all of my face, most of my face expression. I didn't have to worry if I got too carried away with my thoughts and imaginary conversations while walking in public so much that I started quietly whispering to myself, and of course moving my lips. Or doing something else weird like licking or biting my lips. Or inappropriately smiling against my will.
When I stopped wearing it, it basically felt like being naked in public. An awful feeling so bad I wished for another wave of the pandemic only so that masks would seem acceptable again.
Maybe I wasn't the only one. Perhaps it's such psychological thing for someone else.