ok so here is my personal view and how i treat this myself  not to be taken personally by anyone here  but i refuse to grieve wasted time thats something i decided soon after i went to accept my condition i wont be a sorry ass for my past it wont do me any good  neurotypicals waste their times in many different ways the difference is that they feel more fulfilled even if they lose everything  im extremely lucky for being one of the few adults who get diagnosed with adhd and not the majority who goes untreated and suffer their whole lives  im extremely lucky for the years i spent wasting my time undiagnosed because i learned a lot of things there i take the positive out of it  i accept the past is just an illusion and that what matters is the present