I feel very similar. It has actually always been like that for me. I hardly ever did (=finished) any homework in school and university, but I was spending most

I feel very similar. It has actually always been like that for me. I hardly ever did (=finished) any homework in school and university, but I was spending most of my free time sitting at my desk b/c I had to do homework. Now I'm perfectly aware I'm procrastinating while I'm doing so, but I just feel like I must [find out xy / read the current news about xy / read that interesting article I saw / review and close the hundreds of open browser tabs / have some social interaction w/ someone / finish unrelated task xy (e. g. housework) / eat sth / watch porn] at that very moment and couldn't even properly concentrate otherwise. As many others pointed out being overwhelmed by either huge or lots of tasks causes this quite often and splitting up tasks and prioritizing can help in those situations. Nevertheless this pattern sometimes even makes me procrastinate 2 minute tasks for days w/o doing anything useful during that time even if that one task (and/or others dependent on it) is/are the only one(s) I have to do (so to tackle it there neither is anything to split up nor to prioritize.