Minimum age for rhinoplasty and septoplasty
When you have stopped growing, you can have a septo-rhinoplasty if you are sure of the rhinoplasty changes you want. I have done 14 year-olds who have prematurely gone through puberty.
Surgery in females is generally done after age 16 and in males after 17 as facial changes and growth are still going on before then. I would see other surgeons in your area and see if they would consider operating sooner.