A confession + question

About a week ago I shared my shirtless experience at the library and some of u guys wondered if my decision to go shirtless would make others (especially the girls) uncomfortable, which I'm glad to say it didn't cuz there was nobody except me and my teacher (who allowed me to remove my shirt) the entire time. But the question did make me think what if somebody went in while I was shirtless. I actually wouldn't mind if it's a boy/man but I can imagine myself embarrassed and immediately covering up if a girl walked in. And idk why that's the case cuz I can walk around bare-chested at home or in a crowded place with both men and women but somehow I get shy if there are few people in a small space and there are girls.

Do u guys have this problem too or am I just alone tho? :)