Whuat? There are millions of people in Turkey with mixed heritage. I know at least 10 Turks with partially Kurdish ancestry. Genetically speaking, a Turk from E Anatolia is closer related to Kurds than to a Turk from Izmir. Genetics is not about ethnicity; it's more about geography. I bet that genetic studies could prove that even you had at least one Kurdish relative at some point in the past.
German Turks are a different story. They insist on having a separate identity within the German society - and I am not talking ghetto here. They demand to be considered as German Turks, refusing to accept the German identity. This is the main reason why the Turks in Germany have a "bad image".
Lets also be honest Germans would never accept Turks living in Germany as Germans.
Even if you integrate you are still not a German in their eyes.