I am white but my pennis is black?

Are not black but...: Penises come in all shades of skin, from very light (what people call white) to dark brown (what people call black). It's like eye color or hair color. One can have very light skin and still have dark eyes or dark hair. If a penis is normal in every way (texture, sensation, function, size) but is darker than a person's main skin color, that is not a problem. If worried, a primary doctor can check.