Your name tells me that you are a hindu, so you never had circumcision and still you are cut.
Its also called Aposthia.
Its a very rare case, for few men the penis tissue never grows into a foreskin. In 10 percent of male infants, the foreskins will have separated by birth.
Usually when you are circumcised it leaves a little scar around the penis with looks different in color than the rest of the penis, the visibility of the scar varies from penis to penis. On some penis the scar is very visible on some it can hardly be seen.
For example below are 2 penises, scar looks sight different in color, its visibility varies.