There are roughly 70 million psychopaths on the planet. While that figure might sound scary, it's actually not that bad. You see, most psychopaths are of the sub-clinical variety.
What does that mean? It means they fit quite well into society. Your boss could be a psychopath. Your ex-girlfriend that you always thought was just a little odd? She could be one.
Even you could be a psychopath.
Seriously. While most psychopaths (like this one) tend to know there's something different about them, a lot of them just don't think much of it.
When they do receive a diagnosis, most psychopaths (like this one right here) tend to be quite stunned.
In other words, it wouldn't be all that odd for you to be a psychopath without knowing it.