Sorry to hear that you're going through this. I work with other students/recent grads going through the same thing. A few suggestions:

1) To echo some of the other comments here, getting a regular routine will help you get into better habits. Good sleep, regular exercise, and limited social media etc will help with your mood.

2) The setbacks are situational, not dispositional. It really is a shit job market and you likely don't know how to properly signal yet (ie. sell yourself to others). And to make things even worse, brute force ATS grinding is now even less effective since everyone can now game the systems and generate a plausibly good-looking coherent resume using AI.

3) IMO, one mistake I see often is that students think jobs are the only way to gain experience. This is not true. You really have to be constantly learning new things on your own. Your university education is not enough. This means working on projects specifically for learning purposes. I'd suggest you alternate between learning-mode and applying-mode, where you spend 2-3 months just working on shipping a complete project, then focusing on applying to jobs for another 2-3 months, get feedback and rinse and repeat. You can use the learn-mode time to adapt to feedback. I think this will yield better results than applying over and over again hoping for different results.

Anyways, feel free to reach out. As others have said, you're beating yourself up too much. You'll figure it out and find a way through these setbacks. The important thing atm is not to spiral into a vicious cycle. I applaud you even airing this on HN, as it's much much better than sulking alone.