opening closed adoption??

I placed my son for adoption in 1994 thru an agency. I was 17-18 at the time and although I was of legal age at the time of relinquishment, I did not feel that I had any options/say in the matter. I was sent to a maternity home where I was the only one who had graduated from high school and was going to college. I was also the only one of legal age and NOT a ward of the state. At first I was under the impression that my adoption would be open or semi-open, but am not sure what it was finalized as. I was also told that I could pick the family, but getting case studies on the families was like pullling teeth. The case studies were also one sheet of paper with brief details of the couple. When I was getting close to my due date, I naturally began to have second thoughts. I was told that if I changed my mind I would have to repay all $ for my stay at the maternity home. Lastly, I was also encouraged to ask my ob/gyn to induce me as to make my delivery more convenient for me to make to to school on time (start of the semester). Although it has been 8 years, it has taken me this long to be able to face the adoption and the facts. I never received any post adoption counseling. I have no idea if the family I chose is the one my son actually went to. I do know that the family I picked did in vitro and the agency held my son for two weeks before he was placed in case she became pregnant. I don't know whatever became of that. I did receive some pictures from the first year but nothing else. The adoptive mother did provide me some medical info for my future reference when I had kids. I suppose I am looking for information to see if anyone has ever tried to open a closed adoption before a child was of legal age. I would just like to have some contact with the adoptive parents, and possibly my birthson. I am married now and have three beautiful children. I am concerned about making an inquiry to the agency because I do not want them to scare the parents into thinking I am trying to take him away. Too much time has passed and I would never do that anyway! Does anyone know if this has been done before?