For years, Mandisa says, she's tried to "out-nice" her mean-girl friends, but they continue to put her down and call her names. Watch as Dr. Phil offers advice to Mandisa on breaking free from these toxic relationships. Plus, find out how Mandisa can take back her power by giving herself permission to be her own best friend. For more on #lifeclass, visit http://bit.ly/1nPCfuF Find OWN on TV at http://www.oprah.com/FindOWN SUBSCRIBE: http://bit.ly/1vqD1PN Download the Watch OWN App: http://bit.ly/2hr1nX2 Download the OWN Bold Moves App: http://bit.ly/2hglOIa About Oprah’s Lifeclass: The Emmy award-winning “Oprah’s Lifeclass” is a richly interactive worldwide social experience for millions of students who participate in inspiring conversations with Oprah Winfrey on-air, online and via social media. For each episode, Oprah is joined by a hand-picked expert, and together they interact with viewers to share principles and tools that can help people live more meaningful and fulfilling lives. About OWN: Oprah Winfrey Network is the first and only network named for, and inspired by, a single iconic leader. Oprah Winfrey's heart and creative instincts inform the brand -- and the magnetism of the channel. Winfrey provides leadership in programming and attracts superstar talent to join her in primetime, building a global community of like-minded viewers and leading that community to connect on social media and beyond. OWN is a singular destination on cable. Depth with edge. Heart. Star power. Connection. And endless possibilities. Discover OWN TV: Find OWN on your TV!: http://bit.ly/1wJ0ugI Our Fantastic Lineup: http://bit.ly/1qMi2jE Connect with OWN Online: Visit the OWN WEBSITE: http://bit.ly/1qMi2jE Like OWN on FACEBOOK: http://on.fb.me/1AXYujp Follow OWN on TWITTER: http://bit.ly/1sJin8Y Follow OWN on INSTAGRAM: http://bit.ly/LnqzMz Follow OWN on PINTEREST: http://bit.ly/2dvfPeN Why Dr. Phil Wants You to Be Your Own Best Friend | Oprah's Life Class | Oprah Winfrey Network http://www.youtube.com/user/OWN