Life is tough and many people, possibly most, want to be told that it's not really tough, it's just that you're special which makes it harder for you and this pill and less work/hardship will solve your problem.
It's why the USA is filled with people addicted to and completely anesthetized by various prescription drugs.
Sure, real depression actually exists. But it's rare and I suspect the over-diagnosis we're seeing is more damaging by removing people from active and productive lives than lack of diagnosis.
When last did you hear a doctor tell someone to get regular sleep, eat well, get some exercise and face up the the challenges they're presented?
Telling someone who actually has depression--that is, a brain chemistry imbalance that causes negative feelings--to toughen up is about as helpful as telling someone with a broken leg to walk it off.
If "toughen up" means eating well and exercising, it may very well be just as effective as SSRIs: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2291072/
In my anecdotal experience the link between lack of exercise, poor diet, and depression is very strong. Hopefully there is more research into this area, but the main issue with it is that depression and SB is methodologically weak. What counts as "depressed" and "sedentary behavior" are extremely open-ended. http://www.ncbi.nlm.nih.gov/pubmed/20174982
"Just toughen up" is the unsympathetic, counterproductive and, frankly, dangerous advice of the last century. Take your own advice and stop complaining about humanity deciding it's good to care about each other and care about yourself. Or better yet, see a counselor or therapist about your stunted emotional growth.
Secondly, when I did finally get some help, the absolute first thing I was told was to try exactly those things -- improve my sleep, diet and exercise. Your problem is with the attempted treatment you've seen, not really the identification.
As a fictional man with a steel jaw and a nose that was never broken in over 50 fights once said "It's not about how hard you can hit, it's about how hard you can get hit and keep going forward"
It only takes getting up one more time than they knock you down.