It is normal for older teens (17-19) to want to be away from their parents to start living on their own , But there are a large number of young teens (13-16) who think that they should be able to run their own lives now. If they are a minor then the parents are still LEGALLY responsible for them. this is where the breakdown in communication comes in. If the parents keep the lines of communication open, chances are that the teen will come to them for help when needed or the parent will be able to pick-up on when the trouble with the teen is of a more serious nature and can get appropriate treatment. The parents that don't keep the lines of communication open are the ones that the teen walks away from and rebel against (including the overly strict parent) and then they are surprised when the teen is in trouble.
Which would you as a teen rather have, A parent that you could bring your problems to or a parent that didn't care what was going on with you?