I was going for "being an introvert" too, unless you forgot to add "I torture random animals for the sake of it" or "I like to take advantage of people" in your description. In any case, I'm always surprised by the amount of people on the internet who are willing to label a random stranger a psychopath based on a single paragraph of text.
Standard disclaimer applies: Please don't take your medical advice from the internet.
Being an introvert is a vastly different thing from what OP described.
Extrovert enjoy social interaction and need it as part of their "energy", while introverted people will see the same kind of interaction take a toll and thus need time alone. Carl Kingdom explains very will what introversion is about [1]. Also, remember that introversion / extroversion isn't a binary trait but a whole spectrum of behaviours.
If OP lacks empathy and feels the need to exploit other people to his own benefit, then chances are that he has psychopathic traits. That doesn't mean he's a serial killer or that it should be taken as an insult. Of course he can have more information by consulting a licensed practitioner.
Standard disclaimer applies: Please don't take your medical advice from the internet.