Of course you have never felt 'mutilated', any more than circumcised women in Africa feel mutilated. You grew up in a circumcising culture where circumcision was the norm and the majority of men around you were circumcised. You were told it was a quick snip of a little skin and was similar to having your tonsils out. You were told wrong.
It's not "a bit of skin". The foreskin is the natural protective covering of the glans and the only mobile aspect of the penis. The average adult male foreskin consists of one and one-half inches of outer skin and one and one-half inches of inner mucosal lining and is five inches in circumference when the penis is erect. Containing over 240 feet of nerves and around 20000 specialised nerve-endings, the foreskin is the most densely nerve-laden part of the penis and therefore its most erogenous part. Infant circumcision removes all these nerves in what would in adulthood become about fifteen square inches of erogenous tissue. That's almost a four-inch square, constituting more than a third of an adult's penile shaft skin. Half of that, the inside of the foreskin, is extremely sensitive tissue. It's all sliced away in circumcision.
If you think that this amputation is in any way similar to piercing one's ears then you are sorely mistaken. You should watch a circumcision being performed on youtube. The operation involves ripping the foreskin from the glans, like a fingernail from finger, then slicing it off. It is usually done with no anaesthetic and even when anaesthetics are used the results are variable and never totally effective. Even if there was no pain, it is a permanent amputation of healthy functional normal erogenous tissue that can never be undone. This is no pin-prick.
This barbaric practice has many analogies to female circumcision and just a little research on the subject will reveal this. Some forms of female circumcision are much less drastic than male circumcision, and even in the case of clitoridectomy there is still a greater loss of nerves and tissue in male circumcision.