I totally understand where you are coming from. I recommend resetting the password to something very long and random. Have it in written form (make it something unmemorable) and then hide it/ask someone to keep it for you for some time. Then come back when you have more time and can relax whilst using the site without feeling guilty because you are 'wasting' time.
Or use website-blockers. There are some really good ones, let me know if you want suggestions.
Please don't delete the account because you would be dearly missed. x