18 Things Mentally Strong People Do - I especially like the point about staying power. That means that they keep tweaking it until they get it right. Malcom Gladwell pointed out in Outliers that world class performance takes hours of practice.
Showing my true, real self is hard. Bullied, teased, made fun of for who you really were is hard to come from. That's why people put up walls, barriers, masks, to hide behind. They're afraid that people will do it again, just like the people before.