is ADHD harder to manage with time?

when i was a child, i had a tendency to extremely hyper fixate on various topics for months, so now that i'm older it just feels like i've experienced everything even though I technically haven't. the fixations are becoming much more quick in terms of cycles / how long they (don't) last and i spend most of my time feeling bored and empty, just rotting away and feeling entertained by nothing. lately this has caused me to get really stuck in the past, so i spend a lot of time just laying in bed crate digging my own memories and feeling kind of depressed because i have nothing new to be excited by or interested in. it does not help that i don't really have any long term goals or ambitions either, i just kind of exist.

does anyone else feel like this?