I think as you get older, you become wiser with experience. As a teenager or even young adult, it's hard to be certain things won't change for the better, especially when most people seem to be doing fine. Over time, you can really try out the various potential solutions and give them a genuine crack. If they continue to not work, at some point you start feeling assured that recovery isn't realistic. Then you feel like I should have just done it back then and saved myself the trouble. Which might be true as it turned out, but is only really knowable with hindsight. On this site you don't hear the stories of people who recovered as much so it can seem like that's the normal outcome when in reality for the majority it plays out differently (90% of people who survive their first suicide attempt don't ultimately die by suicide). So there's a good reason to stick it out early on for most people, although for some it does just mean prolonging the pain to increase the certainty that the initial hunch was correct (edited to add: a very disproportionate subset of which end up on this site).