You are not alone in finding out the secret. I wanted to leave a link for anyone thats just found out, and would like support.
This page was started in 1995 by Ron Morgan. He found out he was adopted in 1991, later in life. You'll find stories from other LDA's, resources, articles, and an email list on yahoo.
And, as always, 'we' are here for you to listen and support you.