Я полагаю, приблизительно так:
The influence of mass culture on the Outlook of a teenager has a very large impact.
The media can significantly affect the future Outlook of adolescents
Small, but as they themselves believe, already "grown" people are trying to find freedom, to be independent. They watch movies, try to imitate your favorite heroes from the movies, but not this most terrible. According to statistics, 80% of people have the herd instinct and stay close to the crowd. Therefore, the influence of mass culture the adolescent is very high, because at such a young age, children are very easily influenced.
But the impact may be positive. If parents will monitor what is looking and what interests their child, the teenager will move only in a good way.