It's exam study season right now and holy I'm wasting my life. Just spent the entire day consuming youtube, reels playing clash of clans and watching anime I can't see straight my brain is fried and I feel like crap.
Feeling bad won't do any good. Just make sure you don't repeat it next day, have a plan and just stick to it. Remember it's not the first mistake that kills you, repeating the mistake does.
A good way to build a habit is rewarding yourself with some free time in between study, so just pick a time, study and after you feel like it's been a long time take a break but make sure you don't do something that addicting or very long like scrolling shorts or reels or like sitting to watch the whole season of an anime.