need help with zuhud (detachment)

My sense of sanity, happiness, and hope is based upon wordly things, and I want to stop that. Currently, I am studying at engineering university in the second year and I've been trying to get a summer internship for so long now. In doing so, it caused me to focus less on my courses and I have gotten lower marks.

It is driving me crazy and I don't understand what to prioritize anymore. I feel like I have no control over my mind or life.