i think this kind of thinking is more than just an adhd thing  pretty much everyone in my social circle feels this same way including me  i think a big part of it is feeding into the prophecy  if i sit there and find reasons to call myself a waste of time i can go on forever and ill be right it is a waste of time so it just gets worse and worse  do the opposite and the opposite happens right  granted its not that easy to just think the opposite or do the opposite but i promise youre capable of slight perspective changes over time