All too often women do this because they are dissatisfied with the way they look. Your friend may be a different age, at a different stage of puberty, more physically active or of a different ethnic background. All these things affect the way each of you look. The way you see your body is called your body image. It is the mental picture you have of your appearance, and your feelings towards that picture.
Some people are comfortable with and accepting of their bodies.
Others are dissatisfied and may be trying to change their shapes - gaining a little here or losing a little there. Serious examples of a poor body image are the eating disorders, anorexia nervosa and bulimia. Self-esteem is a feeling of how you value or respect yourself. You're not alone, if you have a poor body image. About 90 percent of all women say they do not like their body size.