Not sure if this is Capt Obvious or not. Not sure if this applies to you. Just from my own experience--

Maybe your depression is real. Maybe it's rooted in a traumatic event, etc. Maybe it's brain chemistry. Or... maybe it's because you play videogames for 10 hours a day, stay indoors, get no Vitamin D, get no real life social interaction? That distinction should be deliberately explored by anything going through tough times. Get to the root of the issue.

Perspective and outlook on life is fluid. Your perspective is influenced by what you do with your life, how you spend your time,  what your behavioral patterns have been. Hope, fear, outlook, beliefs, state of mind, habits, happiness, sadness, etc etc. These are all things that can be changed.

I think everybody on earth has gone through ups and downs. In my experience, one of the first things needed to address is to self-reflect and examine the content of your life and content of your behavior. What are the bad habits, what are the issues, what are the patterns holding you back? Attempt to deal with them and move forward, make progress. 

One of the biggest lessons I had to learn was to 1000% challenge the status quo before accepting it. A lot of things in life are cold hard cause and effect. "Dude stays in his room playing videogames for 10 hrs, wonders why he has no motivation, no job, no social skills, etc." Like, duh, cause and effect. Life is ruthless like that. You're not special, life will kick your ass if you that's what your behavior deserves. Turn a weakness into a strength by deliberately and pro-actively fighting against it. Fight against the narrative you or other people are telling you.

Always challenge the status quo - including your own "identity". Too many people conflate their behavior with their identity, so they're scared to change it because it's familiar and it's "what I've always done so that must be all I can be" i.e. "I'm a loser because I've always been a loser" or "I'm socially awkward..." etc. Behavior, perspective, depression, and traits can often be improved if people are pro-active about it.