Why are people so quick to diagnose you these days and say you have a chemical imbalance?

I'll admit I've been depressed for some time now and on occasion it has been severe but whatever happened to "well that's life, you have to get used to it!" I'm not a teenager at 28 and would have to say my awareness of depression probably started when I was about to turn 19. Oddly enough I was studying Psychology at the time and to me it seems like the more introspective I became the worse my depression got...started feeling like I had been depressed my entire life and blah blah blah. But what got me back on track was realizing that yeah, I had depressing times but who doesn't? Life is messy, it's not all peaches and cream and Ozzy and Harriet...death is horrific and more frightening than anything Stephen King can conjure up. The weird thing about it..I noticed around that time 2002-2003 is when all this technology was spiraling out of control...I was contented in my high school years without a cell phone but then when on college campus you couldn't even meet anyone in the courtyards because they were all looking down into their cellphones, I didn't even have one or a laptop. People who look at me like a weirdo for not having them and being super perficent with all things technological...maybe I'm getting off on a tangent. The whole idea of having anxiety, and this kid is bi-polar, we have children's prozac, he has a "chemical imbalance" whatever happened to kids will be kids, now there are like entrance exams for pre-schools, it's ridiculous. I think it's just a major scam by the drug manufacturers to make more money...it's reported that 2 out of 3 people who take anti-depressants are still severely depressed, and side effects of those drugs usually include thoughts of suicide and actual suicide...like WOW, you really think it's a good idea? Can't we just agree that life can be sad and you have to take the good with the bad instead of trying to pinpoint every thought and anxious feeling and overly medicate and wrongly diagnose..it's outrageous, I worked in a pharmacy and there were all these clinical test and documents that would be contradicted by clinical tests and documents 2 months later!!!!! It's bs. The tangent I was going on earlier was that I feel our culture is just becoming increasingly more bankrupt leading to more depression and anxiety..it has nothing to do with chemical imbalance of the brain and everything to do with this celebrity obsessed, instant fame, twittering and facebooking your way into fame superficial culture. How can you not feel like a sucker working hard when some dimwit yo can barely pee straight can become a millionaire overnight by constantly having his nose stuck in a electronic device, who are you not to tell your kids then can get plastic surgery and make viral videos and become america's next top model or idol when there are instant success stories of people who did just that and really didn't have to work that hard to get to where they are, all day everyday they see it on the computers, iPhone, whatever... it has really lowered the quality of life...instead of taking the good with the bad and trying to feel good sometimes we obsess about trying to feel good every single second of every single day which in my opinion leads to people never truly being happy ever... It has become my haters are my motivators, people enjoy being hated and see it as a level of success and respect, like they are being envied...that's just poor morals. Am I wrong or should I take some medication and join the zombie ranks?