Canacrip makes a valid point.

Being in a wheel chair doesn't make you worthless. Having bipolar doesn't make you worthless. Having a job or not having a job doesn't make you worthless.

In our society we put "worth" on things that are really worthless. Look at money. It's paper and metal. It represents gold in some vault somewhere. We put so much value on money that people have heart attacks over debt and paying bills. But if tomorrow all the world economy crumbled and we went back to simpler times, what would all that paper be worth? That's the illusion.

The real worth is you, your existance, your time spent with your family and friends. The lie that depression tells is that no one loves us, but that's such a horrible lie. With all these "illusions" of actual worthless things sometimes family doesn't show us how much they love and need us. When in the end, all we have is each other.