The pigmentation on the penis differs from person to person. Your penis has personality.

If you are truly desperate, there are skin bleaches that could make your shaft skin all white. But that would be very dramatic move. (this is a solution sometimes taken by people who have vitiligo which creates white patches of skin, if they can'ty re-pigment those white patches, they may opt to de-pigment the rest. (think michael jackson). You'd have to see a dermatologist for that. He'.d have no problem talking you out of changing your penis.