DAE avoid starting tasks because once you start, your whole day feels dedicated to it?

Like if I have one important thing to do at 4pm, my brain treats the entire day like it’s blocked off.
Even small things: answering emails, cleaning my room, making a phone call, studying, it feels like once I start, I can’t mentally switch back into “relax mode” again, so I just procrastinate the task for hours instead

Then suddenly it’s nighttime and I wasted the whole day stressing about doing one thing 😭
I genuinely can’t tell if this is normal or not.