It's disappointing to feel sad for no reason. Sadness can be almost pleasantly indulgent when you have a way to justify it - you can listen to sad music and imagine yourself as the protagonist in a dramatic movie. You can gaze out the window while you're crying and think "This is so sad. I can't even believe how sad this whole situation is. I bet even a reenactment of my sadness could bring an entire theater audience to tears." But my sadness didn't have a purpose.  Listening to sad music and imagining that my life was a movie just made me feel kind of weird because I couldn't really get behind the idea of a movie where the character is sad for no reason.

Essentially, I was being robbed of my right to feel self pity, which is the only redeeming part of sadness. And for a little bit, that was a good enough reason to pity myself.

I tried to force myself to not be sad.

But trying to use willpower to overcome the apathetic sort of sadness that accompanies depression is like a person with no arms trying to punch themselves until their hands grow back.  A fundamental component of the plan is missing and it isn't going to work.

Adventures in Depression