The old saying, "killing two birds with one stone".   People often describe an action using this saying, for example, when you take a trip to the store and buy food for dinner and buy supplies for a DIY (Do It Yourself) project - one trip and get two things done.  Wouldn't everything be so easy if everything could be done like that, "in a quickness?" 

If you put your mind into achieving a goal, there are no obstacles you can't surpass.  Through achievement of goals, it can lead to opportunities.

Join a sport or a club while you're at school, it builds social capital (people you meet) and it is an opportunity to develop skills.  Studies show that teenagers who are involved in school clubs or school sports are less likely to be in gangs, violent, abuse drug or alcohol and teenage pregnancies.

Low self-esteem can lead to depression, drug or alcohol abuse, violent behavior, abusive relationships, pregnancy and giving into peer pressure. 

Teenagers often want to fit in with their peers and in most cases low self-esteem can make them feel less important, little ability to stand up for themselves and succeed.  Low self-esteem can lead to development of body image and appearance issues or eating disorders.

A good way to start building up a person's self-esteem is by accepting who they are, just by acting like yourself no matter what other people say, think or do.  Love yourself for the way you look, talk, act, think and feel.  In addition, join a club or activity that you enjoy and create friendships that will be your network for support.