How tall are your parents?
Are you growing at an alarming rate? If so, how many inches within what time frame?
More than likely it is genetic and you can't stop that growth...however I wouldn't mind to add a few inches to my height, I'm 5 foot 2 inches (female)...so I'm stuck.
You could always check with your doctor to be evaulated to make sure that it is not a underlying condition that is causing you to continue to grow....