Just because you're depressed doesn't mean your sad alllllll the time. Every now and then or sometimes more for some people you feel good and happy and you find yourself wanting to do things when normally you never want to do anything at all. There are high moments when you're depressed. Do what you can to take advantage of those good feeling moments.

I know how you feel there are times when I used to go to work and feel happy then when I got home I would lay in bed cry and wallow in my own self pity

The thing that helped me deal with that was seeing a therapist and talking to my brother who was going through the same thing.