You sound like a fugitive that just saw their photo on a wanted poster. I suppose you're feeling a bit exposed now? Now, that your "secret" was leaked? I think this is a good way for you to move forward. You kept this past life in the dark and never really acknowledged it. But when the secret was exposed light shone in on the dark. I believe the more you talk about that secret you take away its power. Let your eyes adjust to the light, keep talking about it. It's time to do some mental grooming and housekeeping. Maybe you will benefit from talk therapy or CBT therapy.
You said your self confidence crashed I say to this: what people think of you is none of your business. What they think, good or bad, does not diminish your worth. I think you worry more about how people perceive you. Why was it so important for you to keep this hidden?