I know I am depressed
When everything requires a huge effort, and seems completely futile.
When getting up and getting dressed is a mammoth task: actually finding and selecting clothes is more than difficult, and takes hours and is pointless as all it does is add to those that will need washing.
When talking to people I fake interest, pretend I have something on so I can't meet them, and slump back into apathy when they are not there.
When hours can pass without me really noticing anything other than my worthlessness.
When I can sleep for more than 12 hours a day while doing no exercise.
When the strongest things I feel are despair at myself, and dull anger at those who think suicide is unreasonable, when it seems a valid choice to me.