Twelve years in the same place is a long time, and the fact that you're asking yourself this now means something doesn't feel right anymore. But the real trap isn't choosing between career and life - it's thinking the problem is the job when maybe it's how you're experiencing it. I mean, before you quit everything, it helps to understand what exactly isn't working: is it the company, the type of tasks, the hours, the people, the sense of stagnation? These are different problems and they have different solutions.
The awareness you see in others doesn't automatically come from making a change - often it comes from the moment when someone actually stops and decides what they want instead of running away from what they have. And here's the real risk: if you leave without knowing your "why," you might end up in a new situation that turns out to be the same or worse. Because it usually happens when you change just for the sake of movement, not for a direction.
A more useful question: if you could change just one or two things about how it is now (the role, the salary, the environment, the hours), what would you change? And then: is there a way to try that thing within the company you're at, maybe by switching departments, asking for new responsibilities, negotiating different conditions? Not to give up on making a change, but to figure out first if that's really what you're missing.