Is it normal to want to fight all the time?

I will be honest. I love martial arts, combat sports, and everything related to it. The best days of my week are my Judo lessons! I have done Taekwondo until I was sixteen on weekends and have done wrestling throughout all my highschool years. Anyways, whenever I walked down the streets, I get thrilled seeing so many people and visualize myself fighting them as if they were as competent as me. I asked my girlfriend about this and she said she too feels that way. Then again, the reason I love her so much is because we both enjoy fighting. And so here I am for a better opinion. I love fighting and dream about it all the time! I only act on this addiction when approriate of course but it doesn't stop it from going through my mind every damn minute.