Okay, sure, but: many physical attributes, social perceptions, and pervasive mental habits probably do become increasingly solidified, even if fatalism about it is counterproductive. Sure, there's plenty of late bloomers, but how many of them do you get from a broken late starting point, and how many do you get from people who worked slowly and methodically and did the right slow things earlier on, taking care of the…
> I'm trying to convince myself to try anyway What else are you going to do? You are where you are right now, and you can either put in the effort to make your life better or you can give up now. The time's going to pass anyway, you might as well make the most of it.
So cognitively I know that's a common problem with an obvious answer, but it doesn't mean I can just skip to the end without convincing the rest of me.