I know how that is. When I came out to my wife and parents, when my parents were fighting, and really every event thus far that should have caused me to cry happened, I just didn't. I locked up, kept it inside, made myself as small as possible, and occasionally became shaky and borderline catatonic. I couldn't cry, and I resent that. I wanted to let it out. Weeks later, my wife and I watched a Pixar movie and I bawled. It doesn't make a bit of sense, but know that you're not alone.