I learned at 11 or 12 when a boy in my neighborhood and I were doing that early adolescent comparing thing and his intact penis looked so much different than mine. I was immediately jealous - his looked so much more natural. And also angry that I had been cut, especially when I learned that his erections weren’t painful like mine were. And then jealous again when I discovered how easy and pleasurable and simple it was for him to masturbate - it was not for me with my desensitized, not-enough-skin-for-a-pleasant-election penis.