To reprove or rebuke oneself; to be angry with or disappointed in oneself. Usually used in continuous tenses. I knew I'd be kicking myself later if I came back and the bag was gone, so I went ahead and bought it. Plenty of companies are kicking themselves for not investing in the technology at an earlier stage.
kick oneself (for doing something)
Fig. to regret doing something. I could just kick myself for going off and not locking the car door. Now the car has been stolen. Don't kick yourself. It's insured.
Berate oneself, reproach one-self, as in I've been kicking myself all day for forgetting the keys. [Late 1800s]