The doctor said you wont "grow much" he didnt say you have stopped growing.
If you have questions about how much you may grow, why dont you ask the doctor who told you this? Im sure he would easily answer anything you want to ask and i dont think he would have meant to worry you.
Originally Posted by TimTom
...he just said something about genitals (haha).
Do you mean genetics
Genetics does play an important role, and you can usually tell alot just by seeing how tall your parents are (however, thats not always the case!). A good diet and plenty of sleep are also important but they have little effect compared to what is already in your genes.
Unfortunately there is nothing written on us which tells us exactly how tall we will grow, so its usually a case of just waiting to see...