My answer to the question is "Responsibility", and that is enforced by this line in your post
People would go hungry if they needed to hustle for fulfillment
This wasn't always my drive. It used to be that I wanted a comfortable life, but I realized now that I want this life more for my family and friends than for myself. This has made my fear of failure even worse now because I don't just think of myself but what that would mean for my friends and family as well.
Yeah, I talked about responsibility towards the end of the post. If I actually didn't choose the he responsible for anybody, I'll probably have been able to just stop hustling and focus on healing medically and psychologically, but yes, most of the times all those struggles are mainly for people we consider family.