I think teenagers are as stressed as adults because of many reasons related mainly to school, friends and family.
In fact, doing well at school involves a lot of pressure, because they have to complete school work, projects and reports and study hard for exams.
Then, there is also the stress of having a social life and being accepted by their peers in popular groups in addition to the physical stress which result from some emotional and physical changes which can leave adolescent confused and stressed.
finally, we can mention also the stress that comes from family problems and sibling rivalry.
To sum up, we can say that a lot of reasons can led teenagers to stress, which can provoke violent reactions, depression and health problems.