How do you know if you're depressed?

CyanideScorpion's picture

How do you know if you're depressed?

I mean, I don't think I am, I just feel REALLY lonely and sad and I was relying on my friend being on here tonight so I could talk to him but he isn't and I have no-one to talk to and I'm just really sad. Why won't he log on?!?!?!