Answer:
There are many benefits of increasing self esteem. One of them is that you will have new confidence to do what you have always wanted to do. When you don't like yourself, you tend to not do things that you want to do that require courage, like running for class president. Also, you are far less likely to develop anorexia, bulimia, and depression. All of these can be linked to poor self esteem, and can cause serious damage to your body or even death.
The best way to increase your self esteem is to read the book The 7 Habits of Highly Effective Teens, which helps you increase self confidence, improve all of your relationships, helps you to be more effective, and less stressed out!