How do I motivate myself when I feel like such a failure?

I am a senior in college. I'm supposed to graduate in a few weeks, but I'm struggling to put any effort into my final project or really anything. I feel like my project is going to be a massive disappointment, and I've already failed because I didn't get accepted to any of the grad programs I applied to. A big part of me doesn't want to finish the term off. Instead, I just want to walk away from my entire life, family, friends, future plans, all of it.
This isn't a new feeling, and it's not the first time it's gotten this bad. I felt like I didn't belong from the moment I stepped foot on campus. Mostly, It lessened with time save for a few ups and downs, but it never went away. This year, it's been so much worse. I know that part of that was one of the girls I was living with. She had to control everything to the point of me stressing out over where I put my shoes, if I got every last crumb off the counter, or if I remembered to put everything in my room. I no longer had a safe space, and I couldn't sleep. I would take naps in my car during the day and shove snacks in my bag so that I didn't have to go back to my apartment to eat. During all of that, she started taking away communal resources, starting with board games, then toilet paper, and eventually dishes. The final straw was waking up at the crack of dawn to her standing in the doorway of my bedroom, yelling at my roommate for something that wasn't actually a problem.
I moved out without telling any of my housemates and haven't seen the problem person since. I hoped that would eliminate all of my excess stress, and while I am nowhere near the disaster I was two weeks ago, I'm still not back to my lower baseline level of stress that I'm used to. I'm still overwhelmed by impending deadlines, even though there isn't much left to do. I can't focus on my assignments despite finally having the space to work on them. Everything I do complete is absolute crap in my mind and makes me want to rip it apart.
I don't have a support system. I now live alone, almost an hour away from campus and my friends. I don't know how to help myself get through the next few weeks and get everything done that I need to. If anyone has any advice, I'd really appreciate it. I want to like myself again, or at least hate myself a little less, and just maybe see value in the things I'm doing.