Someone you've been trying to recruit for a long time, you've been running together for a while, and then you don't have time to look back, and the novice runner is already in a completely different speed group. Someone trains irregularly and without any system, but at the same time easily and effortlessly overtakes you, who does not miss any training and works with a trainer. Someone doesn't train at all, stupidly runs a half-marathon "weakly", and noticeably faster than your personal record after several years of training. Demotivating?