How do you roleplay, when you're just dead flat depressed and can't write a thing.
I don't know anyone here. It's too overwhelming.
You know, you aren't alone. Take a moment... and breathe. It always seems like its an uphill battle... Or like you're trying to move water with a sieve. But you can get through it and it'll pass.
I'm not saying it'll just go away magically and forever.
But it isn't going to block out the sun forever.
And if you can get a ray of light through all of it, grasp onto it and fight for it.
If you're struggling with roleplaying right now... I've got two real suggestions... If its what you want to do... Block off the things that typically distract you... And just start immersing you things in stuff that inspires you. Maybe that means reading or looking at pictures or listening to music. Maybe its even watching a movie. Something that gets an inkling of creativity flowing, and once you get inspired... Just start writing. It doesn't matter what. Half of my writing is half-jokes to friends from the perspective of my characters to get in the RPing mindset.
... Or, if you don't really want to write... Don't push yourself. Take a step back for the time-being and breath. If its a hobby, don't beat yourself up for not wanting to do it. There's plenty of other things in life that you have to bring yourself to half to do that when you're depressed, you shouldn't have to make something fun an obligation. If RPing isn't happening... Find something else fun to do.
I hope you feel better, mate.