struggling with burnout and your own mental health while going through school

how do people handle everything without completely burning out? i’ve felt depressed and depleted for months now. every time something goes right at my internship it feels like five other things go wrong. i’m constantly clashing with my task supervisor. i often feel like a bit of a punching bag. i’m running a small business that i have to keep running because it’s the only way im making money right now. it just feels like all of my energy is gone and im only doing this because i don’t know what else to do.