"apathy, its actually one of, if not THE, worst aspects of things like depression.
see, people see depression and they think "really, really sad" mainly because thats the only part the media shows them, but apathy, thats what will get you in the end, the sadness is mostly a side-effect of the apathy.
its not that you CANT do something about your situation, its that you DONT CARE enough to do something about it, which in turn makes you sad and angry that you dont care, which in turn makes the apathy deeper.
you dont care about yourself, you dont care about your health, you dont care enough to eat, to go out, to do all the things that might help you in the long run if you did them more.
it all culminates in the solid fact that if the cycle of apathy continues, you eventually simply do not care about living, and if it gets really bad, you dont care how it will effect others if you do give up, which is what will eventually cause you to believe that others dont care about you, giving you that tiny push, that voice that goes "it doesnt matter, go ahead"
someone with real, actual depression will not be simply sad all the time, they will simply not care or really react to things, they have to consciously make an effort to do things you would simply do practically on automatic"