I did that. Admittedly, I did that in the 80s, so things are not the same now. But I grew up dabbling with old Apple ][s, and then stopped when high school came around. I didn't even really pick it up in college - but my first job out of college was in the tech world, and my career went just fine from there.
You have lots of time ahead of you. You are correct that you don't need to thrash your mental health at this point in life over such things. Just learn and grow yourself. Don't fall into the traps of FOMO or trying to live up to what the top handful of other youths are doing. Live your own life, enjoy it, learn all you can, and be ready to have an impact when the opportunity truly presents itself.
Ideas is "this is how people do X, they spend/make Y amount of money of it. If they use my product that does Z instead - they will make/waste Q amount of money/time. Where Q is _significantly_ less/more than Y. I am confident this estimation is correct because: a) i know/have first hand some actual real world example of it b) i use some _very_ similar examples that support this"
Only then you go check and see if there is a real demand and you have a necessary skill to deliver.
2. Aggressively use money filter for your ideas - it is not ideal but only good enough measurable tool we have to estimate something's worth. Including ideas and your time investment in pursuing them.
For example if you apply this filter to many so called "micro" saas things you may end up concluding that it is far more profitable and reliable investment of your time to score a good FAANG position. Of course there are many other considerations, but money is the best starting point.
Then just go and create whatever and however you feel like.
If you're talented and lucky enough - something will stick some day.
It's useful to stay within some niche for enough time to build solid skills. To have a backup plan of regular job if you're not lucky.