I starting getting really bad acne just before summer. I had it on my back, chest, neck and face - I felt HORRENDOUS. I couldn't even wear a tanktop or anything nice and I wore a hat all the time. I had to wear full foundation even on the hottest days - which of course felt like my acne was worse.
Though It's cleared up by about 98% now but it was a horrible experience to go through. I was obsessed. All I wanted to do was find a cure. I felt it prevented me from living a full life.
I think its perfectly normal to feel depressed when you have acne because its so disfiguring (please, no offense intended to burn victims who are extremely and painfully disfigured)
I don't know why my acne went after almost 2 years. Maybe that was how long it was meant to last or maybe its because I've completely changed my diet and started exercising.
Good luck with your situation, I know how you feel.