Of course life is fundamentally about eating other life, except for bacteria that eat rocks. So there could be an adversarial element to it
Even more off topic, the only reason I feel the need to comment is my kid is prepping for a Singapore Science test and they seem to have a lot of questions about this stuff.
Added: That means some of the answers on the sample Singapore Science tests are not really correct.
in general blanket statement about the nature are going to always find corner cases
Yes if you be yourself you might feel better, but you might lose out on friends, on a great job, on a marriage even. At the end of the day those people who regret not being themselves may not properly account for the things they wouldnt have if they had been.
If you are an African American or female or both in the tech industry the above couldn't be more true.
This advice can backfire if your natural state can get you in trouble and cause damage to your life. A perfect example of people not being themselves for their benefit is mental health services for people with minor issues. While a person's natural state may be to be very emotional, current society frowns upon most emotions beyond happiness, so it may be more beneficial for that person to take a drug to make them more in line with other's emotional level.