Maintenance (Goal is 15lbs)

So I've always been that fit kid in the group who could eat and never put on weight. Well, that started to change. I started to gain weight or lose defined lines here and there and not care. However, Spring break I did nothing but sit around and eat for a week and a half, and I walked out heavier (if not, then it felt that way) than I've ever been. I've decided to stop this before it takes root. My goal is more of a form of bringing myself down to a point where I can just maintain a constant figure without having to worry about burning off pounds, but keeping them off. I've gained 25 pounds since I've last felt perfectly comfortable in my body, so I figure since I'm still a growing boy, that 15 is a good goal. All of you are an inspiration to me to start good habits as early as I can.