People who overthink usually focus on three things: First, ruminating on the past: repeatedly recalling what has happened to confirm "Was I right back then? Was it really bad?" Second, catastrophizing the future: always assuming the worst outcome, worrying "What if I don't predict it in advance and it's over?" Third, over-interpreting others: obsessing over someone’s words or a glance, fearing "Am I disliked or abandoned?" Essentially: all these are about confirming "Am I safe right now?" Did I make a big mistake? Will something go wrong? Will I be rejected or abandoned? Many people have similar patterns, often stemming from their upbringing: low tolerance for mistakes, magnifying small issues as warnings, or even accompanying punishments. Over time, the brain forms a belief: as long as I make mistakes or upset others, I will be rejected or abandoned.