In a world where everything is quickly packaged and pre-packaged by the media, how can teens rebel?

Rebel. What does it mean? When you look into the dictionary you'll see a definition:
1.a person who refuses allegiance to, resists, or rises in arms against the government or ruler of his or her country.
2.a person who resists any authority, control, or tradition.

For me rebel means doing something againsts rules. In my age it means mainly against parents or rules in school. Usually coming back home later than I should or not doing my homework. Some people rebel by looking different. They are trying to stand out and be seen by society.
So can we really rebel? Even when I'll start wearing totally another clothes than I used to and start looking different - how can I know if it isn't already in some magazine recognised as a new trend? Or what is worse it have already been a trend and now it's out of date? In this times everything we do is not original. It’s hard to find something that someone didn't already do. But coming back to main question - How can teens rebel? I think that even if our way of rebel is not original it can still be rebel if we break our rules.