Before you go jumping on the supplement bandwagon and wasting money, examine your eating habits, daily routine, etc. A couple of things you could do first would be to talk with your highschool's phys. ed. teacher or coach and see if they can recommend some things to do. heh, usually they can tell you the same thing a physician would without having to spend $$$.
From what you're describing here, glutamine, creatine(or whatever else you would like to try taking), won't do anything for you unless you give your body TIME to recover. You need "time", not just supplements. At your age, the only supplements you should need to use are protein and maybe 5 grams of creatine before your workouts. Stop overtraining yourself and start eating a well-balanced diet(if you're not already doing so) and you should notice a big difference.
Also, remember that it takes tendons & joints longer to heal & adjust to weight training than muscles.
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-Snaeke
"I may be fat, but I most certainly carry more weight around than your narrow butt everyday." -phat food for thought
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