There's an old adage that successful people surround themselves with success. It's all about cohort - if you don't have other friends who are pushing themselves the way you are, it will be very, very, hard. It doesn't matter if you're in tech and your friend is in gardening, what matters is the shared struggle, and dreams. It helps knowing you're in a boat others have been in before. Spouses/partners can understand a…
Or, you know, riches come to riches, which amount to the same thing.
People born in slums don't have as many changes to "surround themselves with success". For one, they wouldn't be welcome by most successful people.