First of all, you have to decide what you want exactly to achieve the results you desire. Due to your age as well as the candor you have expressed thus far in this thread, do not allow your surgeon to sway you to do something you do not desire. On the other hand, a qualified surgeon can help you to gain the look you are attempting to achieve.
You seem like you are wavering between too many surgeons as well. Do not go through with this procedure until you feel 100% comfortable and confident with your surgeon. If you haven't already asked, you might want to see the surgeons' "success stories". Also, look at former clients who have had the same surgery performed with similar types of "issues" as yours. Then you can be the ultimate judge if this person is the proper surgeon for you and your needs/requests.
As I pointed out in one of my earlier posts, professionally speaking, I would wait until you were 18 years of age simply for developmental purposes. la_angel pointed out, you will need parental permission, as you are a minor. Are your parents aware of you wanting a rhinoplasty? How do they feel about it.
My last point is again on a medically professional level. You claim you are doing this for you and not because of what others think, yet you are self-conscious and suffer from low self-esteem. That tells me you DO care what others think. These are very normal issues, especially for a young lady your age.
I am not trying to play devil's advocate. I am simply attempting to present you with information that might help you to make an educated and approproate decision.
No matter what you decide, I wish you all the best!