That is the problem. Depression robs us of all passion. We don't care about anything. I am very passionate about nature photography when I am not in a depression. When I am in a depression I don't want to even look at my camera. I want to go back to school and get degrees that I always wanted to get but when I am depressed it is just to scary I don't care anything about it.

What I am saying is that maybe if your depression was successfully treated you would discover your passion. Maybe you do have a passion for your field of study or maybe it lies elsewhere but your depression has to successfully be treated to find out. That is just my take on your post.