Barbara Corcoran , 77, says she overcame years of self-doubt by changing one bad habit. On Thursday's episode of " The Burnouts " podcast, Corcoran told hosts Phoebe Gates and Sophia Kianni that it took her a long time to learn to believe in herself. "It's just funny what your head can do for you. Most of everything, I think, plays out in your head," Corcoran said. "You know, I wish I told myself as a younger woman, you're a lot more capable than you think you are. But it took years to really