Remember that game your father and older brothers played where they'd grab your forearm and make you hit yourself? and ask why you're hitting yourself while laughing hysterically?
Well now you're all grown up, why you still doing it? I'm not! I hear you exclaim. No, not physically, but you are metaphorically if you're doing anything that hurts yourself or future self, like excessively smoking, drinking, taking drugs, eating junk food, slothing, putting up with a shit job with shit pay with shit people and a shit boss, moving from one abusive relationships too another, exercising yourself to death, throwing all your hard earned money down the drain instead of saving for retirement and many more ways I'm sure.
So I'll ask again. Why you hitting yourself?