BS, I have nothing to do with Germany.
good ;-) you are really on the right track
But if you look like a Pole (because your genes)
It has to do with genes! You can't be Polish without Polish blood! If you are mixed with an other country, you need enough Polish genes to feel Polish!
Polish look Polish, Polish-Slavic, East-Slavic. Sorry I know how a Polish look like.
There are a lot Slavic countries, Serbia, Czech, Ukraine etc. But Polish look very very different than for example Serbs. I would say Polish look more like Russians.
Strange you lived all your live in Poland and don't know how Polish people look like.
But sometimes it's difficult. some Polish People you could also say he/she is Russian, or even with Slovaks can not be classified correctly by from which Slavic country he/she is.
In a nutshell: Serbs, Croats or Kosovans it is sometimes difficult to say from where he/she is (For example a Serb: is he from Serbia or Kosovo?). The same with Czechs, Poles or Russians = The Slavic people from the South (Serbia etc.) look very differently than the other from the East (Belarus etc.)
But you see the Slavic and one who know people from different Slavic countrys can say whether he/she is more likely from the south or from east.
In Poland, Russia, Czech Republic, Belarus have a lot very light skin, blond hair, blue eyes. In the south you will find almost no blonde people, black hair, brown eyes and the skin is not as light.