It's hard to tell at you guys' age whether your increase in strength was helped by Creatine or not. At your age, if you're working out regularly you can gain muscle mass and strength pretty rapidly on your own. (Ah, those were the days!) My own son has gained about 8 lbs. of muscle mass in the past 3 months since starting with a top notch weight trainer/conditioning guru. I have been amazed. No supplements involved, just solid workouts and a teenage appetite to fuel them.
What I'm telling you is, don't think it's all in the Creatine. Give yourself some credit, for one thing. For another, the mindset that the Creatine is great is not but a step or two away from the mindset that you should use more, or maybe something stronger -- and more dangerous. Don't start down that road.