But most people start out with a life that's a mix of things that matter and things that don't, and only gradually learn to distinguish between them.
For the young especially, much of this confusion is induced by the artificial situations they find themselves in.
It may be that less bullshit is forced on you than you think, though. The amount of time you have to spend on bullshit varies between employers.
There has always been a stream of people who opt out of the default grind and go live somewhere where opportunities are fewer in the conventional sense, but life feels more authentic. Most large organizations (and many small ones) are steeped in it.
The things that matter aren't necessarily the ones people would call "important." Having coffee with a friend matters.
You won't feel later like that was a waste of time.
If you fire or avoid toxic customers, you can decrease the amount of bullshit in your life by more than you decrease your income.
But while some amount of bullshit is inevitably forced on you, the bullshit that sneaks into your life by tricking you is no one's fault but your own.
You need to make money, and making money consists mostly of errands.
Indeed, the law of supply and demand insures that: the more rewarding some kind of work is, the cheaper people will do it.