I don‘t know. Where do you live now? Do you speak German? Did you keep up German traditions? Do you feel more German or more local, wherever you are? I know that, through the last 2 wars and their aftermath, a lot of Germans in the diaspora who had emigrated at some point or lived in areas previously German that no longer were post war, were either made to deny their German roots or did so voluntarily in order to blend in locally. In East European areas, many were literally forced to stop speaking their language, etc. due to Russian domination. In the Americas, many changed their names and stopped speaking German after countries like the USA put Germans (and Japanese) in internment camps during WW2, seized their properties, money, etc. which most never got back. So this is a complex topic. On a more practical level, you might want to look into current law as to who may apply for German citizenship, based on heritage. I have a few things in queue on German minorities in Eastern Europe.
The Diaspora tag so far: http://willkommen-in-germany.tumblr.com/search/diaspora