Am I dealing with depression?

[User4567]

I'm posting under an anonymous profile for obvious reasons.

Lately I've been constantly feeling down. Like, I'm worthless... a failure... a disappointment to everyone. I don't get joy from anything lately and I'm barely sleeping. Getting a phone call from my dad earlier telling me that I never do anything properly in my life and that I shouldn't contact him really hasn't helped. In fact, it's made it 10x worse. I've been thinking that if I was to die, no one would miss/care about me.

It's half three in the morning and I'm trying to hold it together, but I'm failing. I don't want any sympathy, I just want to know if I'm dealing with depression or not.

Thanks.