That is untrue, mine fraction rate went from 10% (abnormal) to 73% within a month.
Your gallbladder EF will not get better. If anything as you get older you will start to have attacks, I did not have stones but had a slow gallbladder and out of blue i started getting attacks... you can stay on a low fat diet, try and cut red meat and pork, greasy food and high fat foods out, and dairy stick to non fat and skim milk this will help a ton!! You are not to young to have your gallbladder out..there was 2 girls under 20 in my surgeons office that told me they had theirs out, so depends on surgeon I guess.
just for purposes of information:
my cousin had her gallbladder out at a young age
10, 11 , 12, or 13... but it was definitely before her 16th birthday..
so your doctor is misleading you !