I took various creatine products in High School and I got very minimal results. My belief is that age does play abit of a role as you are not fully developed until around the age of 18, your still growing. In addition, the Ethyl Creatine has better effects than that of a Monohydrate(again this I am stating this from personal experiences and from friends). Best Ethyl Creatine I have used and a few friends have gotten resuts from as well is BSN
CellMass. You appear to have a lean physique and assuming you goals are to bulk up in muscle I would use a weight gainer in the mix as well, I wish I would have back then.