dazed and confused

I gave my daughter up for adoption in 1986. I had this very immature view that she deserved more than I could give her. The adoption was handled by an older couple who showed me the profiles of 3 couples and told me that they would choose one of them. They told me that I could write to them to request info every couple of years if I chose and maybe even a picture. I felt really good about the whole adoption. I always felt as if I did the right thing for my child even though it nearly destroyed me. I pulled myself together and went on to have twin daughters who are almost 13. I have raised them alone since they were 2 and now as a much older mature person realize I could have given my first daughter a good life too, but still had no regrets. Then through a fluke I discovered that the couple who handled the adoption lied to me, the whole process was a lie and I feel as if I am caught up in a nightmare. I would never do anything to hurt my daughter but can you please explain to me how an adoption obtained through fraud can be legal? Its much to late to do anything about it, my daughter is 18 this year and hopefully will want to know me. I have a lot of old wound opening that I fought long to get past, guilt and self hatred etc. Now I feel all that coming back knowing I was so gullible and allowed myself to be manipulated. Its too late for me but please tell me if something like this happened today someone in my position would have some recourse???