Evolutionary biology shows that the highly cooperative species, rather than the highly competitive species survive dramatic shifts. Charles Darwin posited it is the survival of the fittest; rather than the survival of the strongest.
The truth is you are good enough, because you are who you are, and who you are is good enough. The question is what prompts someone to have a ‘not good enough,’ belief? The beliefs you hold about yourself are the indoctrination and conditioning you experienced growing up.