I think I have this same problem. It's just sort of this weird urge to not do things, right? Low energy, bad mood, or the task being legitimately unpleasant or difficult will make the problem worse, but even without those issues, trying to make yourself do stuff feels horrible. Even when you can do it, it seems to take way more willpower than it should.

Seems to be an issue with executive functioning. (It's a common problem among people with ADHD or traumatic brain injury, and I think ASD also. TBI resources call it initiation impairment; ADHD and ASD resources rarely acknowledge that it exists.)

Unfortunately, ADHD meds are the only really good help I've found, and even that is inadequate. In my search for other coping techniques, this is the best I've been able to come up with:
--The problem is less bad after I come home from work. I think it's because this is a point of transition, but I'm not transitioning to anything in particular. (I have to plan ahead to use this time effectively.)
--It's easier to do things after they become a habit or routine.
--"Cueing" -- it can be helpful to have someone or something tell you to start. (That is, something external triggers you to start, even if you already know about the task and don't need a reminder.)

This page has everything I know about the problem (not much).