It's hard going against everything you've ever known. I went through a lot of changes after finding out that my brother was alive after being away for a long time... then finding out that he was a vigilante... and that the man who raised me wasn't my biological father. My whole life was turned upside down, and that was only the beginning of my journey.
As far as parents go, you may actually have them. By the sounds of it, they may not even know about you. If you actually wanted to know who your parents are, there are doctors here who can find that out for you. But that is only if you want to know.