I can relate! I've also doubted my cognition but understanding my neurodivergence and especially the memory issues better -- reading about Severely Deficient Autobiographical Memory was a revelation -- has helped me a lot. Most of my cognition works just fine, and over the years I've learned tricks to go around the problems, at least to some extent.
For me, the value is exactly in the experiencing it in the moment. Then again, repeated reading/viewing does build up memory snippets, and at least there's that I remember something bringing me joy, so even thinking about that does bring some of that joy back even if I don't remember the details.
Finally, as to "is something wrong with me", understanding the mechanism behind my memory issues has helped me to shift away from this. Sure, my autobiographical/episodic memory is busted, but it's not like there's something wrong with me, the person I am, if you get what I mean.
Actually Autistics (npub1pce…geep)