One of the defining characteristics of being a psychopath is an inability to feel shame or empathy. If you feel bad about being a psychopath, then a.) you care what some online test thinks about you and b.) you are capable of feeling shame, thus by definition you are not a psychopath.
The one exception is if that test or diagnosis makes it impossible for you to achieve your goals. For example, if somebody broadcasts to the world that you're a psychopath and that means you get turned down from jobs or the government starts a manhunt for you, then a psychopath would feel bad. But on a self-report questionnaire on the Internet? That has no consequence on your actual life? If you feel bad about your psychopathy score there, you're almost certainly not a psychopath.
The one exception is if that test or diagnosis makes it impossible for you to achieve your goals. For example, if somebody broadcasts to the world that you're a psychopath and that means you get turned down from jobs or the government starts a manhunt for you, then a psychopath would feel bad. But on a self-report questionnaire on the Internet? That has no consequence on your actual life? If you feel bad about your psychopathy score there, you're almost certainly not a psychopath.