Sometimes I just hate myself for doing some kind of stupid things

without a second thought..Or maybe with second thought? But when it comes to a complicated situation I just can’t make a right decision for what to do or what not to do..Then when few days/months/years later I flash back what I did/said were so stupid, like ‘why were I being so stupid for doing/saying such a foolish things?!’..In the past I was always doing stupid things, but NOW, I’m still, too…why can’t I avoid this problem? Oh why, oh why? :( *that’s ma forever kind of unsolvable problem.