There have been so many myths about how men get their penis size. Sometimes people say that a man's penis size can be shown by their foot size or even their height. The truth of the matter is that no matter how a man looks on the outside, it is rare that you could come close to guessing what was underneath his pants. It doesn't matter how tall they are, how large their ears are, or even how big their hands are; penis size is genetic and you pretty much get what your genes tell you that you will get.
There have even been studies done on this exact subject. The British Journal of Urology took 104 men who had feet size that ranged from size 8 to size 13. Of these men, the study found absolutely nothing that would say that the men with the larger foot size had larger penises. They didn't not study height in particular, but the larger the foot, the larger the height so it was a good starting point to disproving height had anything to do with penis size.
Penises do not grow like bones and muscles do, so you can't expect that it will keep growing as a man goes through puberty and gets taller. Penises are a lot like noses and ears in the way that it is just an appendage to your body and really doesn't have any basis to how large or small your body is. As you have plainly seen on other people, they may be very small in stature but have large ears. The same can happen with a penis.
Penis size is determined while the embryo is still being developed, which means that your penis size is almost decided for you before you are born. Hormones and genes affect the body after reaching puberty but just as each gene determines the human body, the gene that affects the penis is different from others in the body. There is no indication that the size of any part of your body can be directly related to your penis size. You simply have to find out as you age what size it is going to be.