I had surgery when I was a child, because I was too shy to go shirtless in public. What if other boys laugh at me?

I have a big birthmark on my right arm, all over my arm. Just be brave once. I even joked that mine was a tattoo, and you joked that it was left by a brave man. Let them all know, and there will be nothing. Did you steal anything? What did you rob? What am I hiding? What are you afraid of, man? A scar is nothing! I was thinking that my stomach could be kicked, and a scar was cut into a meteor. Man, as a man, this thing is nothing.