Most Helpful Guy
You, as a girl, and all girls for that matter, need to stop listening to people who aren't qualified to determine what's best for their health.
Your doctor, personal trainer, nutritionist and other health professionals are who you want to listen to.
Only about 2% of women in the United States have eating disorders. Most women need to understand the dangers of not enough exercise, eating lots of processed and fatty foods and of course, not knowing what a healthy weight should be.
If you haven't done so, you and all girls (and guys for that matter) should speak to those people who are best trained to help them.