Looking for birth mother or siblings

I am a fair skined blue eyed male with blond hair and was born in Athens Greece, in 1963 I believe my real mothers name was Maria Spiriotupolus. I was adopted to an american couple, Adopted father was in the US millitary. I've had a great life and proud to have been raised as an American. Would like to meet birth mother or any possible siblings, or hear from others in a similar situation especially Greek adoptees and talk about their experiences and thoughts.