ANDY'S ANSWER: If you started puberty at age 8 or 9, it would stand to reason that by your age your penis will have grown more than other boys of the same age who are only now just starting puberty. Over 8" IS on the larger side of the scale, but still within normal for an adult male. I don't think you can do anything to stop it from growing as fast as it has been or as big as it's inclined to get, but since you started puberty early, your penis may be just about finished growing.