Why does my fully German family have olive skin and black hair?

I've been mistaken for a Latino, Native American, Arab, and an Italian. We have all the features of those people but the ancestor we get the features from is a full blood German. It has been suggested that maybe we were jewish but they were devout Roman Catholic. Is there so string of Germans with these features as apposed to the "Aryan" features Hitler and my teacher says Germans should have?