I've just found out that the man who I called "father" is not my father, what should I do?

He is a fisherman Arsheesh. I lived with him as long as I remember myself, in a little village, but today a man in rich clothes was ping through and stayed for the night; and he talked to my father, and my father acknowledged that I was not his son, and that he found me in a boat, seemingly a survivor of a shipwreck, with an adult who died, trying to save my own life. What should I do now?