Some people are lucky; Some people are not.
The more you learn about this world and society, the more you will realize that Life is random (chances), and yes, Life is not fair. Reality is depressing.
Most people who still always keep saying that “if you work hard, you will be successful!” are naive, ignorant, and simple-minded typical “optimistic/positive/happy-go-lucky” people you always see everywhere. And even for those people who realized it and therefore said that what’s important is to “work smart”, it also usually often means to be sly, cunning, opportunistic bastards who are too often selfish, pricks, ruthless, cold, heartless, and only care about certain shallow things like money, profits, power, position. And sadly often for the vain reasons.
There are often far too many challenges, obstacles, and also bad people who lurk just around the dark corners to eat you up, use you, trick you, manipulate you, etc etc you just name it. That’s why usually the truly good people, and the genuinely smart, wise, and idealistic, visionary type of people who have truly great and noble ideas for the progress of the world are often crushed, and losing out to the selfish, vain bastards and pricks of the world and society that I’ve just mentioned above. No wonder there are many stressful, sad, depressed, and suicidal people all around the world/planet.
This world is a shithole. Humanity is sadly not that great. Life is often disappointing. Society is sick. Existence is (mostly) just a meaningless, stupid, and pointless pain and sufferings until you die.