The self-esteem of a 14-year-old girl is always in flux , and usually in a bad way. It's around the age when you start developing insecurities about what you look like since your body is changing and the attention you get is changing along with it. You become more aware of your clothing choices, the way you wear your hair, and how others perceive you. And those insecurities can be very hard to shake, even into adulthood. What happens to us as children can shape who we become as adults, and if t…