Similar situation, in that my family line is essentially 100% German, although I grew up elsewhere. When we visited my grandparents' home city, it was kind of a shock how much I looked like everyone else. It didn't make me feel particularly comfortable or uncomfortable either way, but it did surprise me how, well, related we all looked in a way that had never happened to me before.

My favorite part of the trip, though, was getting complimented on my English by other friendly but clueless tourists who asked me for directions and the like. I told them thank you, my parents were very insistent that I practice my English from a young age. Technically the truth! :D