I originally just wanted to make some quick money, but I started living seriously

At first, I got the Gate Platinum Card, with a very simple purpose:
"Any cashback is a little bit better."
Later, I realized something was off.
I started planning trips carefully.
Managing bills diligently.
Optimizing spending structures thoughtfully.
I even started keeping accounts.
Previously, I thought these were things "mature people do."
Now I realize:
"True happiness for adults is a sense of control."
When you know where every dollar goes, how much cashback you can get, and what you can accumulate, spending suddenly is no longer just spending.
It feels more like:
"Long-term operation."
It sounds very capitalist.
But it indeed gives a false sense of:
"Life is gradually getting better."