ISO b-family, I am your daughter born 9-21-1981 in AZ

I am desperately seeking my b-family, particularly my mother and father. I was born 9-21-1981 at Maricopa County Hospital, or so my birth certificate says, I believe at night. My b-parents were young and worked at a resturant. I was adopted out by Family Service Agency in Phoenix on Flower Street, to the Shaffer's. I have been searching on and off for years...if you know ANYTHING please reply.