Career wise, I’d focus on something mathematics-adjacent. How were your grades? If they weren’t excellent, I’d think you could pivot into software engineering or data science.

It sounds to me like you also need to work on your motivation and mindset. You need some wins. Even small ones would probably help a lot.

What helped me climb out of my rut was hitting the gym regularly. I held myself to going once per week, and it became an addictive habit.