You should ask a doctor if you're unsure as to how your body stacks up against other men of your age. I would have to say that it does sound as if you are a little behind in puberty. Going off of almost no knowledge of this matter, you may have a horomonal imbalance... Or... This might be perfectly normal for you!

Remember, it's not how big you are, it's how you use what you've got!

it might.