I wish I could tell you this and that, but I don't know what that would accomplish. Motivation for one is linked to the chemical dopamine which is really lacking in depressed people. So that equals procrastination. So basically I'm trying to tell a perfectionist to not be hard on herself. Right.
As far as philosophically, I don't think the question is "is life good?" I think the question is always "do I want to live?" Life isn't great for a lot of people but they still want to live. I think it must be instinct.
Since you are here the answer must be yes. I've even said that too! If my life is not different by such and such age then I'll leave the world. But the day comes and it just goes by. The only importance that future dates have is what we attach to them. And as that day comes you'll realize that. Because each day is not much different than the next.
I really like the advice of missjess to try self love stuff. It pains me to think about when you and other SA sufferers turn their obsessive thoughts on themselves. Somehow I'd think if you loved yourself more it wouldn't be so harsh though. CBT has helped me in some situations but I think self love would really help at this point. For anyone with anxiety.
I've attempted ending it before. And one thing I can tell you is that I didn't have any hope then. But now I do and I can see possibilities in my life. You say you don't see the joy of living but that could and probably is only temporary. Things change. 7 years ago I'd often use words like "can't, never, hopeless, hate, stupid" and other such words in my thoughts. You can mix and match various thoughts with those words and they are horrible things to say to just about anyone.
As for this: "I try to imagine that this is true. I mean my degree is in philosophy so I try to understand it from the perspective that this is true but I can't. I don't. I am very conscious of myself and I have seen people believe whatever they want to and I just don't understand how they do it. How can I make myself believe something I don't really believe in my heart?" All I can say is fake it until you make it. And you'll hate me for saying this
but put on a happy face!
All this is coming from someone who was diagnosed with chronic, severe depression at 12. And generalized anxiety disorder and social anxiety disorder. All labels and they have their uses. But I think they can become a self fulfilling prophecy. At least though since the CBT the severe part of the diagnosis can probably be taken away. Don't lose hope!