Congrats, man! Not many people can do that! You ought to get picked in an NBA draft. Back to the question, I'd say play as much Basketball as you can and always jump when you can. That will not only make your jump higher but will make you taller. And always stretch your arms when you wake up. That will keep your body in state of taller body because when you sleep, you get a few centimeters taller and back again when you wake up.
A Basketball goal, or hoop, is about 56½ inches in circumference (56.55 inches). The rim is 18 inches in central diameter, and the top of the rim should be exactly 10 feet off the ground.
Basketball players should be taller, so I would say about 63 inches.
You should do an adequate amount of leg and glute workouts such as lunges and squats; but try variety there are many different types of lunges and many different types of squats. For your waistline you should do core workouts (this doesn't mean just abs, you should workout your whole core).
A Size 7 basketball is usually 29.5 incheshttp://www.hrsinformer.com/2009/10/how-to-choose-a-basketball/
Light workouts should not stunt growth at all, but bench pressing heavy weights can.
You should get your basketball coach a Basketball because they love Basketball
A basketball hoop is 18" in diameter and the formula for circumference is pi x 18" (3.1415 x 18"=56.54866")
The size of a high school basketball hoop is 18 inches across on the inside. The hoop or ring as it is called is made from 5/8 inch high tensile steel. The entire assembly, which includes a safety feature, in mounted so the top of the ring is 10 feet above the playing surface below.
Depends how much you are in shape or you are even in shape
Leather basketball
I am sorry to hear about your problem but perhaps you should just try a gym workout at your local gym. If you do not want to go to the gym for workouts, perhaps the following will give you some ideas about workouts at your home: www.muscleandstrength.com/workouts/main.html
A basketball!