I'm going to be very honest. Living independently usually requires many more hours and energy than an office job. The mistake many people make is thinking they'll develop a fun hobby and that it will turn into money. When you really want to earn money, that hobby usually becomes a job, and a more demanding one at that.
I don't know what country you live in, but generally, if you're self-employed and you don't want to work one week, no one is going to cover those hours. That's money you'll lose, it's that simple. And when you have to force yourself to work and meet goals and deadlines, you lose a lot of the fun.
Some people have no problem with that and are happy doing what they do, but it depends on the person. In my experience, if you have to ask around, chances are you're not that type.
If you really want me to tell you something... So, you should know that video games are an ultra-saturated market, full of people like you (and with the arrival of AI, the number of independent developers has skyrocketed) who are creating their games with the intention of making a living from it. The harsh reality is that for every success story, there are hundreds (if not thousands) of failures.
As others have mentioned, it's a lottery. But you're young and you have time to try.