I heard burnout is casued not (only?) by stress but about the feeling of little of no impact of our job. I've been in high pace job before being cuite young an

I heard burnout is casued not (only?) by stress but about the feeling of little of no impact of our job. I've been in high pace job before being cuite young and eager and I felt no burnout. Currently being in a moderate paced one (still not a laid back one, we are well paid staff expected to perform), but I am burned out now due to the feeling it makes no difference. Why am I wasting my time here?