I can relate to your problems. For me, it was that I couldn't enjoy anything but I had the goal to get a good degree at a prestigious university. Depression only got worse over time and I lost any goals I had, but I'm still finishing my degree as I have nothing else going in my life and nothing would make me happy. Studying doesn't even help to escape anymore, since I can't concentrate and have trouble thinking. Yet, it's still possible and I manage somehow. So maybe stay in university and try to do something about depression. I think making such significant life decisions shouldn't be done in an emotional state.