You can protest all you like, but the fact is that you gave an unforced role claim as doctor really early, despite the fact that, if you were town, it would make you a prime night-kill target. And somehow, despite your role claim, mafia didn't target you. Why wouldn't they target a town claiming doctor? It just doesn't make sense.

I'm more convinced than ever that you're mafia. I will eat my prosthetic leg if you turn out not to be mafia.