Usually what you are describing suggests what is called an umbilical hernia. These are usually repaired by general or pediatric surgeons. Ask your parents to set up an appointment with your pediatrician or family doc for and evaluation and referral.
Thanks and best wishes.
An "outie" belly button can be easily corrected and may be the result of a small hernia. Sometimes insurance companies will cover this procedure. Discuss this with your parents so you can make an appointment with a doctor to answer all of your questions. Good luck.
Correction of an outie belly button is not difficult and can be performed under local anesthesia. The umbilicus is nothing but a scar and it can certainly be made smaller. The next step is to be evaluated by a plastic surgeon to consider your options. At your age you will need to consult the advice of your parents as well.