14 and I Think I Might Have Knock Knees
TeenHealthFX recommends that you schedule an appointment with your primary care physician or an adolescent medicine specialist as soon as possible to discuss this issue. Your doctor will most likely refer you to a pediatric orthopedist for a thorough evaluation of the situation and treatment recommendations. Anyone with 11cm or more between the ankles when the knees are touching needs an x-ray evaluation (scanogram) and possible growth guided procedure, which can only be done while children are still growing. If someone is bothered by knock knees it is important to meet with a doctor so that they can be evaluated for surgery given that knock knees can lead to the knees wearing out more quickly, as well as pain in the knees, legs, ankles and feet.
As for talking to your parents about it, you could tell them that you are concerned you have knock knees and you would like to meet with your doctor right away so that he/she can evaluate the situation. You could also give your parents a copy of this question and answer to get the conversation going. If your parents are hesitant to take you to the doctor, then FX recommends that you speak to your school nurse about it right away so that she can intervene on your behalf.
If you don't have a doctor and live in northern New Jersey, you can call the Adolescent/Young Adult Center for Health at 973-971-5199 for an appointment with an adolescent medicine specialist or contact your local teen health center. You can also contact your insurance company for a list of in-network providers.