I may be wrong, but i think that the life of teenager are complicated time.
Tenagers aren't children already, but they aren't adults yet. Teenagers have many problem. For example they can't find a common language with the older generation sometimes and they have the hard choice of the future profession. This choice affects the rest of their future life. In addition teenagers meet their first love. It's a wonderful time for them and one of the best stages of life. This event stays in one's memory forever. Unfortunately, the first love can have unhappy endings. It seems to me everyone are going through very difficult and emotionally this time. It leads to problems in communication even with the best friens.
More over teenagers perceive all of problems are terrible and unsolvable.
One the one hand time of teenagers are very difficult. One the other hand this time are wonderful and unforgettable.