Are you familar with the concept of herd immunity? Were you not vaccinated by choice, or it just isn't a big deal in Germany / Europe?
I have no idea how it works in Europe. But it could be a question of age. Measles was once so common that people over a certain age in the US are simply assumed to have had it at some point. That is, vaccinations aren't recommended for them because they are unnecessary.
My parents certainly don't hold any strong feelings about it, so I guess it wasn't recommended at this point in time? I don't know.