I killed a bird and feel no remorse- What's wrong with me.?

The whole part about putting it out of its misery is normal I think however enjoying watching it suffer and not feeling bad at all is not normal. There have been numerous studies done about serial killers and how as young people or in the beginning they enjoy killing animals and watching them suffer because it gives them a feeling of control and superiority - these people are socio paths with no ability to feel remorse. . . . Chances are your just a normal person with a strong stomach though:P