I totally agree with the opinions on here.
"being good enough" is not a goal you can work towards.
it'd be something like "finish writing a book"
or "get x amount of subscribers within that chapter/time frame". idk. tangible ones.
then you when you succeed or fail, you can analyse why. ... was the goal too unrealistic? what were things that went well, what did go wrong?
choosing goals that are vague like "I want to make a good story" or "I want to have a lot of subscribers" will never make you happy, since you can always say "it should be better, it should be more"
try to think of small and short-timed goals that you can complete in a forseeable future.
and some bigger but still concrete goals that you can still work towards.
another thing about age and feeling like what you made isn't on the level you want it to be ...
keep it smaller? try to go for short stories that you can complete within a few months.
having a finished thing, and then another, and then another is super satisfying. and even if one story flopps, because that is just always likely, you will have the satisfaction of completion, the growth from the experience, and you can find out what worked and what didn't and use it on your next project.
and then, when you've hit your stride, or when one of the short projects gets received very well, you could build on it and go for a longer series.
I find it really liberating to not "be stuck" with a story that just doesn't seem to work and only makes me frustrated.
... that is, if your feelings of dissatisfaction with your work are not just external through lack of outside validation (tho I wouldn't blame you either. A storyteller wants to be heard after all.)
and again, about the age.. that's nothing.
people usually don't yet manage to have their break during their twenties. that's just a time for testing limits, and trying all sorts of stuff.
there's also a chance that you only make a hit in your 40s or 50s.
experience does improve ones story telling. and even five years with classes, isn't a lot yet.
what I'm trying to say is, you still have time. sticking with it is always worth it. and you will only continue to grow. both as an artist and as a story teller.