Well, this was my first time with my girlfriend. We were just playing and one thing lead to the next and we ended up having sex. I did not know much but she had some experience so she helped me a lot and I followed her direction. It lasted maybe five minute but after that I have been thinking about it all the time and I want to do it again so badly that I can't concentrate on any work and I have also lost my appetite. My question to you is that is this normal to feel this way?