Be modest in thinking and ambition targets.
There is, statistically, always a richer, better looking, smarter, faster and ……taller individual.
Don’t link your happiness to the vagaries of statistics and it’s arbitrary or random outcomes. Remember that there is no absolute definition of perfection. If everything is relative then just aim to be the best you. That is a fair and attainable objective.
Kids are under extreme pressure to excel. To be better than everyone. Adults too. The pressure is impossible because you just cannot be. All that you achieve is creating a nation of unhappy losers.
In 50 years we will all be dead and none of this matters anyway.