Do you talk to yourself (独り言)?
I do. A lot. I am my own best friend. Sometimes I tell myself jokes. Sometimes I ask myself questions. Sometimes I remind myself of things I need to remember. I laugh and sing when I'm alone. But, until about 2 years ago, I was socially aware enough to only do those things when I was alone. If I behave (振る舞う) like that in public, people might think I'm strange. 
For about 2 years, we have all been wearing masks whenever we go out. 
One good thing about wearing a mask is that people can't see me talking to myself. When I'm in the supermarket, people can't see that I'm whispering, "Eggs, milk, bread. Eggs, milk, bread." Or, "What should I make for dinner tonight?" Or, "Wow! Broccoli is cheap today!" As long as I keep my voice low, I'm pretty sure other people can't hear me.
But what is going to happen when this Covid pandemic is over, and I can go out without a mask? I have been talking to myself freely in public for about 2 years. I don't have the mental training anymore to keep my thoughts silent inside my own head. No one can see my mouth, so I say things (quietly) out loud (声を出して). When the masks come off, I'm afraid everyone will think I'm a strange person.
When that time comes, I ask for your patience and understanding, as I learn again how to function in society with my mouth fully visible (丸目え) to everyone! 
