'Be yourself' is more about being 'genuine' and 'true', than it is about 'everything you do IS yourself'.
People say this when they mean 'be true, be genuine, and don't let yourself be contradictory or deceptive about who you are'
It's very closely related in meaning to the saying 'know thyself' - the better you know yourself, the more genuine and true you can be.
Most people :
- don't realise how much their fears drive them.
- don't understand that different area's of their brain compete for the outcome (hence we can want two different, competing, outcomes at the same time)
- don't realise how automated so much of their life is
- don't comprehend self deception
- don't understand that their actions affect their beliefs (which is why being true to yourself is so necessary)
- don't comprehend what self esteem is about, nor how to truly build it
- don't understand why it is better to be vulnerable
As an example of one part of what I said :
Many people are afraid :
- to display selfishness, anger, lust, desire
- of looking foolish / of making mistakes / of being ingnorant
- of conflict
- of being rejected
- of failing
There is a list a mile long of most peoples fears - they just don't realise it. And each 'category' of fear has many different subsets of fears. Yet we can negotiate and train most of those fears away.
These of course are a list of the 'negatives'. Many people have great positives. The soothing away of the negatives in our lives gives us much more solid foundation on which to build our positives.
Building on our positives is something we should always be doing