First off, you probably shouldn't use the word "retard", even to describe yourself in that fashion. You run the risk of really offending someone who comes here to give you advice.
As for the missing emotional connection, you may want to try to watch different music videos to see what the actors/dancers/artists are doing (facial gestures, body language, etc.) in response to different lyrics and try to mirror that. If you build up a large enough repertoire you should be able to act out just about anything you want.