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Also, as you're only 16 there's a good chance you still have some growing to do, meaning you may not be potentially that far from average, all things considered.
Here in the UK you need to see the regular doctor first and then he refers you to an endocrinologist, without that referal nothing done. Not sure how it works in America where you presumably from i gather...but if i were you i'd act now! All the best bud