True, but your alittle on the extreem side.
Being positive is good in many ways, the biggest one is that it keeps you trying to better yourself.
If everyone walked around misserable and gave up after a tiny failure the world would have already killed itself by now.
Thinking positive makes people believe that overall, most people are good.
Although i have had times where all i want to do is listen to depressing music and relish in my self pity, in the end, its my positive thinking that gets me back up and doing life.
Without positivity, suicide would be the answer to most of lifes problems. In fact suicide is a big problem already and im sure there is correlation between the lack of positive influences and personal self-worth.
Anyways, nice rant but i would suggest for you to take a step back and realize the world is already full of negativity. Its much easier to be mad and negative than to brush it off and stay positive.