People think depression is someone being super sad. It doesn't have to be all about sadness. Depression can be blank, a void that can't be filled.

Loss of interest or pleasure in activities once enjoyedIncrease in purposeless physical activity (e.g., hand-wringing or pacing)
Feeling worthless or guiltyDifficulty thinking, concentrating or making decisions

Etc.

Those are all ones that I have that are sure signs, as well as many other family members having forms of it. Especially the first one, that's the one I have the biggest problem with. It's not all the time though, it comes and goes. Music and books are the only things that interest me anymore, people are annoying and confusing and they dislike me. If M reads this, this is not about the argument we are having. This is me blowing off steam, trying to get people to understand that depression does not just mean sadness. It means an enveloping black void that eats you away until you can care about nothing and no one.