I love this question!

To me, being yourself means being completely honest with other people about what you think and believe, and also having the courage to act on what believe. If you are unsure about certain beliefs, then I believe one should also be unafraid to preface what they say about their certain thoughts/beliefs with "I may be wrong about this, but..." or "I'm still thinking about this one, but...".

For example, Ray Dalio's Principles: Life and Work begins with the following line: "Before I begin telling you what I think, I want to establish that I'm a 'dumb shit' who doesn't know much relative to how much I need to know. Whatever success I've had in life has had more to do with my knowing how to deal with my not knowing than anything I know."

I think the condition of not knowing as much as you need to know in order to make a decision is relatively close to the condition of all of us. There is always more for us to know, and we don't have enough time to learn everything we need to know about the world. Accordingly, I think the most productive outcome and strategy for everyone is one in which we are all honest about what we believe. I also believe that what is most beneficial for humans is often rewarded in the long run, which is why strategies like reciprocal altruism, tit for tat, forgiving tit for tat, and tit for two tats have been proven to be more evolutionarily beneficial than those in which we repeatedly stab each other in our backs.

Neuroscientist Sam Harris also wrote about this in his book Lying, in which he very strongly defends the idea and importance of persistent honesty.