Other posters may have a better understanding of it....maybe you just have a low level of empathy that is part of your personality. I am on the other end of the spectrum...I am highly sensitive with a high level of empathy. Other's moods affect me. Do you think any experiences in your life impacted your sense of empathy? Has a personality disorder been ruled out? I don't think it makes you a bad person you just have a low level of empathy. Best wishes.