But then again, I personally like blood sports like dog/cock fighting, and found bullfighting pretty entertaining. When I was a kid, me and my friends used to collect red and black ants in a can as if it were a Roman coliseum, tossing in an occasional grasshopper or black widow for more interesting action. Stakes were smaller, but the bloodlust was the same.
You do realise that displays of cruelty to animals in childhood is a strong predictor for the emergence of Antisocial Personality Disorder (ie. being a psychopath) in adulthood?
To be honest I think you should talk to a psychologist about your inability to feel empathy for living creatures, before that lack of empathy extends to human animals.