Doing nothing at work all day, how to get unstuck?

hi guys I found myself stuck doing nothing at work at all, like I spend the whole day playing online chess or watching reels, bs like that, anything will do if I can avoid the work. I am stuck working on a project that I feel makes no-sense, with a demanding junior team mate who calls me all the time for every little thing, that doesn't listen to me nor learn, and overall I dont really get along with them. The point though is that my coworker, regardless of the quality of their code, manage to close their tasks while I always find myself stuck in the same spot, i feel paralyzed and anxious all the time. I really dread the idea of working on this project, the structure is confusing for me, full of antipatterns, I cant think clearly when the code base is so messy. To make things worse the few time I actually try to do something I find myself unable to do the silliest things, I forget stuff I studied just weeks ago and I move with the sluggiest pace, and this push me away from the work even more. I am considering quitting, really, I feel ashamed of not putting my weight at work considering how welcoming the rest of the team was and how everyone is pretty chill, even the boss, so i don't wanna be the lazy guy that cause the management to enforce crazy rules for everyone. We work in full remote and we catch up rarely, most of the time weekly sometimes every 2 weeks (aside from that co worker that calls me everyday..), I spend most of the week at home with my aging parents, more often that I would admit I cant bring myself to shower, during those anxious days of inactivity I end up staying up till late in the desperate attempt to make something out of my days, so in the morning I am even more tired I got diagnosed with adhd but i am not taking medications at the moment but i might try to get back on it (because i remember it wasnt really that helpful) I hope someone of you has a magical advice that will solve all of my problems because I feel at a loss