first bit sounds like being understimulated, which'd probably be an ADHD thing
I have these rich fantasy worlds I'll daydream in. Like legit world building where I need things to make sense.
if you're daydreaming a lot and it gets in the way of functioning, it could be maladaptive daydreaming. if you just do it for fun and it doesn't, then that's just pretty normal
It feels like I'm distracting myself from my life sometimes. I'm not in a great place, and I know I'd start tasks when I'm stressed. Sometimes I'll drop make plans and then drop them immediately. Other times I'll freeze and stall before making a decision.
I do this too, for me it's that i get super anxious about low-productivity when im anxious, so i try to do something, but then physically cannot focus due to the anxiety
i have disassociative identity disorder, so i have a lot of experience with disassociation. personally none of this feels similar to me, aside from the daydreaming (but that's coupled with other symptoms). needing to do things in silence, for example, is the exact opposite for me. when im dissociating i prefer silence, and then i kinda blank on what im doing and then it's done. since i have pretty hardcore amnesia barriers that might just be me, though