Is this dysthymia

i dont understand, i have no issues, i dont smoke i dont drink i dont do drugs i dont have any relationship problem with any girls i have no major distraction, but still when its time to study i procrastinate and end doing bad on exam there are times i would procrastinate so much that i would convince myself to start studying for an exam JUST 8 hours prior. i wasnt like this always, ive been a scholar student this problem started in first year of my uni where i went into major depression and i still feel like i havent recovered even though it has been 3 years since depression, this procrastinating habit has stayed with me till date and is haunting me everyday. I booked my mcat test for sept 4 and i started studying in May somehow i delayed studying and didnt study at all to this day, i feel bad daily but constant procrastinanting and pairing it with youtube and everything i feel like have no motivation left for life i dont have fire that i used to have before, what is my issue even called? what kind of illness am i going through?