....I have asked her, however, she thinks I am too young to do it....

What are her SPECIFIC concerns about this (your age)? There may be very valid reasons for her to be worried; you need to understand what she is thinking.

Remember, the Hippocratic Oath tells doctors to "First, do no harm" - the good ones take that VERY seriously. If your doctor is worried about this, you need to find out what issues she is weighing.

We sometimes forget that our doctors are always second-guessing their decisions when things don't turn out the way everyone was hoping. I'll bet a lot of them do a lot of "If only"-ing for those patients.

Even though we may tell them over and over that it is ultimately our decision which course of treatment we choose, they CARE about us and what happens to us, and they worry right along with us.