My balls have dropped, when will my penis grow?

Hi, in the past year or so, my balls have grown and have dropped, but when will my penis grow, it is like 3" erect, my friend was at my stage 2 years ago and he is 2 years younger than me and he has a big penis like 5" erect. Do I have to wait 2 years like him or could it just grow big at anytime as I am... show more Hi, in the past year or so, my balls have grown and have dropped, but when will my penis grow, it is like 3" erect, my friend was at my stage 2 years ago and he is 2 years younger than me and he has a big penis like 5" erect. Do I have to wait 2 years like him or could it just grow big at anytime as I am 16 and he is 14.
Update: Everyone in my family have a big penis, does this mean they had a small one at my age then it grew at some stage
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