Are you a parent to a child between the ages of 13 and 23, and are you seriously worried?
Is the above true, even though you have tried to change the situation for the better? It can be helpful for adolescents to have a few consultations with an young persons therapist to help them break free from their own line of thought. The therapist knows and understands what troubles the adolescent. A therapist can offer just a little more than a parent/guardian can, because a therapist is not an insider, allowing him to be free from patterns that have taken hold.
Sometimes it’s preferable, or even necessary, for parents/guardians to be involved in the consultations once or multiple times. Communicating at a different level can make a big difference. As a parent, you can be so involved that you lose the ability to find a different approach.