I was always aware of this particular trait in myself but until recently, I thought it was mutually exclusive to my dysphoria.
I always assumed that this was due to my inherent body dysmorphia.
Until I came out to myself recently I never thought to put two and two together.
So.....
I have never been comfortable shirtless to the point that I've NEVER slept shirtless.
The amount of times I have been shirtless I can count on one hand and the amount of times I've slept shirtless I can count on the other (the times I can remember at least).
I think cis men are far less afflicted with body issues than any other genders regardless of sexuality.
I think to myself that I'd be shirtless more often if I was thinner.
BUT there was a time when I was thin enough to be shirtless without shame and even then the article of clothing stayed on.
I always had a singlet (tank) on the very least.