My only suggestion is that there may in fact be an underlying psychological cause for the fact that you are feeling so depressed. There's a chance that you are suppressing information deep within you - something that actually makes you quite angry - and this suppressed anger is feeding the depression.

Hey I'm in the same position as you. I have a really caring family, everything taken care of me, I go to college, people seem to like me, but I too feel so utterly empty and lonely and I know where you're coming from. Don't let it get to you