If you think about being yourself, what does that mean? If asked, "Do you like being who you are?" not everyone would say yes--some people dislike themselves. This can be the product of low self-esteem or perhaps a deep sense of guilt. Liking yourself doesn't have to occur all the time, however. There are times when you behave in ways you aren't proud of and say things you wish you could take back. Yet being yourself is more mysterious than like or dislike.
To be yourself, you have to know who you are. "I" isn't simple and in many ways is very elusive. A two-year-old writing on the walls with crayon is being herself, and so is a middle-school bully tormenting a classmate on social media. Running wild, acting on your worst impulses, and flouting all the normal rules are behaviors worth suppressing. But if you are candid about yourself, such impulses exist inside you.
If you take a look at how your mind operates, you'll quickly realize that many agendas compete for your attention. In certain situations you call upon a wide range of emotions that want to be expressed. You act differently at work than at home. Habit, memory, and old conditioning compete over your attention. these agendas have their own claims, and there has to be a decision-maker and overseer who chooses which persona to adopt, which feelings to suppress, which behavior is appropriate at any given moment.