There is this meme going around the Book of Face, where some picture is overlaid with the words "When you are dead, you don't know it. It is only hard for everyone else, because they see you are dead, but you don't know. It's the same when you are stupid."
Depression is like that, only exactly opposite: When you fight with depression, NOBODY else knows it. It is only hard for you, because you see you are depressed, but THEY don't know."
And it sucks. Because you can't explain it. Or make it better.
You just have to face the demons alone.
That's not a fight everyone is capable of doing. Or winning.
And win, lose, or draw, you face the fight alone.
Because nobody else can see.