first off, i agree with everyone's advice in here. You are young its hard to keep the different kind of emotions your having at bay. you arent sick, and there is nothing wrong with you. shit, im sure a few of us have done something along these lines before. the best thing that you can do is find a different approach to excitment, as in porn. maybe try to get your girlfriend involved
makes for a sexy and sometimes funny experience! enjoy being a father and enjoy life! *hugs*