When I was interviewing people about this topic I found out something that I never really noticed before. Usually when teenagers start to push their parents or siblings etc. away that’s when their actually going through something in their lives like bullying, depression, anxiety, and self-harm. There are other reasons why teenagers push families away like if the parents are still treating them like they are still kids, making them feel smothered, being overly critical, and not listening or being interested in their interests. But most of the time teenagers start pushing away their family when they are dealing with the rough issues in life.
That link that I just put it explains more why teenagers don’t talk to their parents about the big issues that they are dealing with everyday.