IMO, you don’t have to take a feast or starve approach but find a balance. My vacations weren’t the kind of Hawaii getaways that people in Hollywood are probably accustomed to. Cheap food, low end hotel, etc but I got to travel and see new cultures.
I’m not posting this to say I figured out some genius financial insight, but anyone reading this who’s young or early in their career - for the love of god, do save money in your retirement account. Assuming there’s a company match, it’s essentially free money. Do pay back student loans unless you can discharge them. A ruined credit is going to close so many doors, from financing an auto purchase to home ownership and other things.
You will have to retire some day, and depending on the broken welfare system (at least in the US) to provide for all your needs is reckless.