Gnobe, you can't keep comparing your own life to that which might be typical of a 25 year old. You are your own man with his own personal life which comes with its own problems. Yeah, you're different but so are all of us. We all have different issues and fears to face.
Gnobe, life is not a checklist of things to tick off that will then magically make you happy. It really isn't. I guarantee that reading this there is at least one mid 20's man not unlike you, but with many women in his past, a large circle of friends, the "life and soul of the party", a life you think would make sense looking in, but a man who is depressed like you. While of course circumstances can have a major impact, its the illness/condition that makes the difference.
I know I've said it before, but it's important IMH. The one sure thing in life is change. Even if you do nothing things will change, but if you do something things will change and for the better for you. You're on that road now with your treatment. That was the most important step and a very brave one too. That's a change right there. Maybe you're not seeing the benefits yet, but I guarantee in a years time you will see more changes.