Doppleganger - ness

I don't know if it's just me, but I see people that look like people I know left and right. It doesn't matter that I'm in Spain and half of the people I see are Latinos, and more than half of the people I know are not Latinos. I see people from Elementary School, High School, College, Grad School, at every turn. I think I may be crazy, or maybe just missing old friends and randomly thinking about them in complete strangers that may have the tiniest resemblance to them. I wonder if I'm alone in that...