When I play for fun I immediately withdraw like 80% of the amount and I keep playing with only 20% of funds and whatever happens happens I will not be sad,
That's a good strategy for gambling for fun, you don't let the entire amount of what you've started with to lose all. When someone forgets to gamble for fun, that's the common thing that happens and that is to lose entirely the money that we've started as a bankroll.
this is what I call to play for fun which usually involves playing little money compared to when you play to win it big you need a much bigger balance for that and that is the difference between the two.
The difference in playing with big money is that you'll be able to stay longer if you wishes so. But when you're too emotional and even if you just stayed in the casino for a few minutes and you've been triggered, you might still lose them all if you're careless.