To anwer what I consider your deeper question, there are generally only two paths to financial security:
- Inherit (either your own family or marry into one)
- Invest in your own human capital to maximize the income you can earn per work hour, then start saving enough of that income into buying partial ownership of the economy (e.g. via stock market capitalization-weighted index funds).
Working more hours, which "passive income" strategies almost always equate to, just robs you of what little free time you have on this planet. Almost nobody thinks on their deathbed "I wish I had spent more hours of my life working".
school pretty much failed to teach me the right way of life.
The education system's job is giving you the opportunity to maximize your human capital. It may have failed you there, but that doesn't mean you need to abandon that pursuit.
Is it possible to make some form of passive income from sidehustles?
In the binary way you worded this: No. You must always leverage something to generate income. Different methods require different levels of activity, though.