I know exactly what you mean. Your story is so close to mine I'd think I wrote it. I hear things from people or I think they are talking about how i smell. I thought I was ugly during my early teen years to an unhealthy end and I've been to at least 4 doctors and a therapist who couldn't smell me.
Maybe its OCD. I've had people tell me I focus on things to much (and I did games in my head to that included those behaviors). I wish you the best.