you can take the test at ok cupid of all places [because nothing goes together like psychopathy and dating] and find out whether or not you're one of the surprisingly high number of people who score as a psychopath but who function in everyday society.
here's my result [hopefully].
if that doesn't work, you can check out the google search results and take one of the tests offered to find out.
or you can just be all textbook about it and read the hare psychopathy checklist, which is how professionals determine psychopathy.
this was inspired by seeing a daily show interview with jon ronson on his new book, the psychopath test.