Not seeing medical professionals as soon as medical problems arose. I now live with (likely) permanent chronic pain which may well have been preventable were the causes addressed at an earlier date.

The mental model that states that since all past problems have been inconsequential, all future problems must therefore be inconsequential is a problem here. Holding that mental state (my past problems have evaporated without issue, therefore my future problems will do likewise) is problematic because most people have not experienced enough major problems to draw on a meaningful sample size here.