How should a person know if they're a sociopath or not?

Sociopath: Pattern of disregard for, & violation of the rights of others. They cannot conform to social norms. They can be impulsive, deceitful, aggressive, irresponsible & lack remorse.

Antisocial: The modern clinical term for sociopathy is antisocial personality disorder. The hallmark of this disorder is the person seems to have no conscience, or sense of morality, or right or wrong. This person cannot empathize with others, is opportunistic, predatory, and often thrill seeking. An example of this would be Charles Manson.