I'm sorry you're feeling so discouraged. I hope it gets better soon. I would like to point out a few things that may help. You seem to be young. I am not. I don't see any signs that people are any less caring now than they were. Unfortunately it was never evident that the world was a particularly caring place. Two things I've learned... there are a lot of caring people and... most people have serious cares of their own that weigh on them and may make them feel incapable of taking on more.
If you've ever approached someone in a situation like you describe and offered help/comfort then you know it can become a serious commitment. Maybe more than you bargained for. But I agree that it is the right thing to do. It just sometimes takes more strength and commitment that most people are in a position to give.
Hope things get better for you soon