Most male circumcisions are decided by the parents during infancy. Comparatively few adult men make this choice. It is a difficult choice, an intensely personal choice, and I feel ultimately to be the right choice. As an adult you have the right to make this decision yourself.
Adult circumcision is understandably an infrequent choice. Most procedures are performed for either religious (e.g. conversion to Judaism) or medical (e.g. phimosis) reasons. Few men are excited at the prospect, despite its benefits. I used to tell myself that no uncircumcised man would ever possibly go through this voluntarily, and then I did it myself, voluntarily.
Unlike infant circumcision, adult circumcision doesn’t hurt. It’s done under general anesthesia, and you are sent home with a prescription for a narcotic pain medication such as Vicodin. As long as you take your pain meds on a regular schedule you will feel no pain.
You may also wish to read my reasons for circumcision.