I am not so sure telling people you are a psychopath is going to help them understand you. Most people don't understand how someone can function without emotions. People tend to play off of each others emotions, even joking with each other tends to play off of emotions.

Yes, a lot of memory tends to be based on emotions, more than most realize. Hense the saying "We may not remember exactly what someone said, but we never forget how that person made us feel".