RE: Depression: The disease that makes you isolate yourself from your friends, and then helps you be extra miserable later when your friends do things without you.
It definitely is. I've been there myself, and spent several years in that rut- anxiety to boot.
The only thing that helped me was discovering longecity (forums) and the nootropics reddit.
These things helped me build the bdnf to develop new habits and ways of thinking- coupled with meditation and diet changes. You have to just realize that getting better will take you changing habits that are engrained in you one thing at a time.
Posture this week, voice the next. Diet the following week, and building new habits, like reading a book a week, the next. Push yourself and you'll realize that depression was a blessing in disguise- it made you discover a new and more powerful you from the rock bottom.
Cheers, and much love your way bro. Things will get better if you hold hold on. Better than ever and much more.