Back then, you could maybe have been kidnapped or given away improperly - they did not have they same kinds of systems for tracking missing children, and they didn't have DNA testing. Do you know for sure you were in the foster care system? If you had an agency that sounds like a private adoption, not DCF, which would have been HRS back then. So if you are 42 now you were born in 1942? Therefore you really have no idea what happened?
It seemed like the first thing to do is open your adoption records. There is a process in Florida for doing this and this would be a reason to do it. You have to get an attorney, file a petition, and have a hearing. You need to contact an adoption attorney in the Sarasota area as soon as possible.
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