I relate to this all too much. I have fantasized about shock collars in the past, too, and a few years ago I asked a friend to hurt me whenever I didn't complete homework on time (

don't do this). In the long term aversive conditioning, like shock collars and other punishments, increases the shame and stress we already feel, making it harder to approach tasks and reducing our self confidence. Don't punish yourself, it doesn't work !!
If you have this much trouble doing the things you want to do (normal people do not often fantasize about shock collars as a productivity hack

) consider looking into ADHD and associated treatments. The Adult Self Report Scale is what I used to evaluate myself and decide that I needed follow up from a psych. Even if you don't have (the DSM definition of) ADHD, coping and organizational strategies for ADHD can help a wide variety of people.
What helped for me was external accountability, and stimulants.
I love body doubling as external accountability. You can get it sneakily by calling someone and asking for on-the-phone company while you do chores. Additionally, any real life obligations can serve as accountability. I never have a good sleep schedule when I am #unemployed and #isolating but when I have classes, clubs, scheduled hangouts with friends or appointments during the day, I find it is much easier to have a consistent sleep schedule. It is difficult to have a paper written on-time when I abide by the deadline, but when I schedule office hours with my professor a week before the paper, it's easier to have something completed.
You mention finding things more difficult to complete because you feel them as a "demand". If you'd like, take a look at demand sensitivity (not necessarily a diagnosis, just a concept). You may have to figure out how to structure your life so things you must do do not feel like orders you are forced to do, but tasks you complete of your own agency. I had an alarm set for months that was titled "TAKE YOUR DAMN MEDS", and I ignored it every single day. I decided to forego the alarm and seriously consider if I wanted to take medication for my own reasons. I do not have a medication alarm now, but I take my meds (near) daily, because I want to, not because pixels on a screen tell me to. I understand not all things can be chosen, but one can find a self-chosen reason to do many things that feel imposed.
As for stimulants, (for ADHD), the gold standard are psych meds if you can get ahold of them, but if you cannot, for years I swore by four packets of black tea a day. Not ideal, obviously, but it helped me.
In general, I have read that executive function increases with age. The older you get, the more you'll learn about yourself, and the more skilled you'll be at getting yourself to do things, on average. It is a cliche, but in this case, things really do get better.
Yay good luck to you! I believe in you so much, okay? Please report back with what works for you!