Man no offense but there is nothing worse than this type of sparring partner.. you ruin it for the rest of the guys and no one will want to spar with you unless it's to teach you a serious lesson, and that guy will step up if you don't learn to control yourself.. it's just immaturity. Think of sparring as a game, my old trainer (great trainer btw, Mark Brackenbury) didn't even call it sparring, he called it "playing".. really set my partner and I in the right mood for a nice calm technical sparring session. If you are constantly brawling you won't learn anything besides how to gas yourself and throw crazy looping punches which WILL get countered, you won't go anywhere in fighting if you keep that up. It's all a learning session, so stay calm and focus on what you're doing and how to counter what and have some fun.
edit: it's good that you actual recognize that you are going too hard, that's a good first step.