The media have been busy bees applying the term "troubled" to a lot of human beings. For instance, there was brandname actor Philip Seymour Hoffman. Now there is late NYU student Rown Altenburger. Here in this New York Post article she is referred to as a "troubled teen."
The term has no meaning. Any human being's existence on planet earth is filled with troubling times. Those could range from a severe case of acne in high school to losing a child in death. So?
During those difficult times we can learn new coping skills. There's that cliche that Christopher Hitchens didn't like - what doesn't kill us makes us stronger. His final days he did not position as a growing experience. The pain almost took away his ability to write.
On the other hand, during those difficult times we may despair. That's a common human emotion. It was illustrated well in The New Testament when Judas the Apostle committed suicide after betraying his leader Jesus Christ. So?
Human life is not not a walk in the park on a sunny day. If we are not troubled by it we are not experiencing what it means to be human.