When it comes to bullying, it's no longer just a boy's world " more and more girls are becoming aggressors and victims. A recent survey of sixth- and seventh-grade girls showed that almost one in three admitted to hitting someone as a form of bullying. What makes matters worse is girls are now turning to the Internet to cyber bully other young women, as well as post videos of some of their physical fights.

Rebekah, 14, writes to Dr. Phil: I have been bullied since I was in third grade, and it has never stopped. I am now going into ninth grade, and I am not looking forward to some of the nasty teenage girls I might be facing there. I was being bullied physically, mentally, emotionally and cyber. My grades plunged, and I wasn't feeling like I had anything to be here for in life. I hit a real rock bottom. 

Dr. Phil and his son, Jay, speak with Rebekah and her mother, Peggy.

Dr. Phil correspondent, Katie, 23, says she's familiar with both sides of the girl world. She spends a day with Rebekah to see how bullying affects her daily life. Then, Lauren and Molly were taunted while growing up and are now fighting back ... with kindness. And, a former bully opens up about how she became a mean girl.

Plus, could you be encouraging bullying in your child?

Sabrina, 22, says the bullying she endured from other girls growing up still affects her today. How can she let the pain go?

"I don't know if I've ever truly felt beautiful."
 

Beth is the mother of a sixth-grade girl who was targeted in a cartoon video her classmates made called The Top Six Ways to Kill Piper. She joins the show via telephone.

How have the schools responded to Piper and Rebekah's reports?