A striking aspect of depression for me is that I have no motivation to do things that I want to do; in fact, I don't even know what I *want* most of the time.
I go to work, take care of my family, make sure I meet my obligations. But I don't have the motivation to do things solely for me. I want to hide under the covers much of the time, but that's a nonstarter and is hard to adequately explain.