Why Do Teenagers Sometimes Stop Sharing Things With Parents?

[Maya]

I remember, when I was in my teens, there were times when I didn't share my feelings and emotions with my parents, even though they were friendly and were always trying to help me. I think growing independence is normal, but now that I am adult I also thing becoming secretive suddenly can leave parents unsure what is happening. When do you think should parents respect privacy, and when should they become more involved?