Is it normal to suddenly get urges of killing people around you?

Okay, lately I've been getting sudden urges to kill people around me such as family and friends. I've always found it hard to communicate and understand others and constantly feel like people are expecting something from me. I decided to question whether this was normal or not when someone told me that I look as if I wouldn't care if everyone around me died. I'm honestly not sure about if I actually would care. I sometimes even go as far as planning how I would kill someone. It doesn't matter who. Are these urges normal?