When you were kid, your friends were decided by your parents. But as you grow up, you take your decision yourself. Peers are the friends or the people which are very close to your age. They also have the same interests and life style like you. In the teen age, you are enough capable to take independent decisions. You decide your own peers and friend circle. As you spend enough time with your friends and peers, you are very much influence by each other habits and attitude. Most commonly teens attract towards bad habits soon.