German passports are only issued to German citizens. Having German ancestors resp. the fact that your father and/or your mother was/were born in Germany is unfortunately not enough to attain German citizenship. Rather, your father and/or mother have to have been German citizens at the time of your birth. If you were born before 1 January 1975 and your parents were married, you only attained German citizenship if your father was German at the time of your birth or if your parents submitted a declaration by 31 December 1977 stating they wanted German citizenship for their child.