Not having a specific purpose. This might be temporary. Might be due to school making pursuing passions much harder due to depleted energy when free time comes.
The goal is not the point! If you optimize for goals you ignore all detours and are at higher risk of stopping. Yes - you are guilty - school exams (and for hosting a massive Graduation ceremony at the end for us to forget all suffering with peak-end bias) - the reason for the conditioning: of course, schooling/exams is temporary. :)
Targets that are most often do N times X per time will totally be ruined upon one failure mentally and you will quit. It's like the famous "Streak" in some apps like Duolingo and Snapchat. Especially with the rise of perfectionism such things are really common. As such some people might give up such measurable "SMART targets" in favor of the natural law of life.