at age 16 you are able to see your doctor (be in the exam room with your doctor, have private conversations with your doctor) without parents being in the exam room watching the you go through your physicals, discussions with your doctors and other treatments)

usually around the time puberty hits (anywhere 10 yrs of age on up for some its sooner for others its later) parents start asking their children - would you like me to stay here with you while the doctor does the exam, treats you... or would you like me to wait outside the door or in the waiting room for you.

if the child asks the parents to wait outside or in the waiting room the doctor or doctors nurse will "retrieve" the parent for the parental side of the appointment- discussing the problem treatment, followup care and if needed whether another appointment is needed.

by the teen years the doctor or nurse calls the childs name and the child follows the nurse to the exam room while the parents wait in the lobby (unless the parent needs to tell the doctor for the child what is going on and why they needed to be seen, if thats the case the parents follow with the child, first few minutes of the appointment the parent explains to the doctor then excuses their self so the teen can have their time with the doctor. afterwards the doctor talks with the parents.

You can find out how your doctor handles teens by giving the doctor a call and the doctors office staff will tell you, whether you need to be accompanied by a parent and whether the parent will have to stay in the exam room with you. or you can ask your parents.