How to treat or overcome or stop anti-social elements during adolescence.

Peer pressure is the influence exerted by a peer group, encouraging individuals to change their attitudes, values, behaviors, etc, in order to conform to group norms. It is most commonly associated with adolescents , in part because most of them spend large amounts of time in schools and other fixed groups that they do not choose and are seen as lacking the maturity to handle pressure from friends. Peers influence your life, even if you don't realise it, just by spending time with you. Sometimes peers influence each other in negative ways. For example, a few kids in school might try to get you to cut class with them, your soccer friend might try to convince you to be mean to another player and never pass her the ball, or a kid in the neighbourhood might want you to drink alcohol with him. 

The best way to overcome such negative influences, the person needs to learn to ignore them or better leave such groups where these activities are regular. He should also take actions to stop such activities.
Ignorance and patience are two essential qualities to be developed in an adolescent to tackle with the antisocial elements during this age.