Lack of spiritual development is oozing from this post.
Depression is a result of exhaustion, mental or physical, but it's important to remember that you can cause yourself to be in a depressive state as well; I won't even use my religious position to argue against this, let's think logically - if you are sad about a certain problem\group of problems - will those problems go away? This person's (And the movement's as a whole) notion that we all suffer from the world being "unfair" is a projection, they feel miserable, and percieving themselves as "Smart", regard their stance as the most logical.
It's obvious that one can enjoy life, and even be successful even with desparaties in mind - it's a matter of perception. It's reasonable to think "I could live better", while enjoying what you have, and working towards better conditions. But immediately writing off this as impossible because "Diseases, parasites and the rich" exist is delusional. I assume this person is from a 1st world country, so they do not have much grounds to complain in the first place!
"Didn't ask to be born" is not an argument either, as it is a natural function of all living organisms; This also philosophically implies that we must decide for the unborn, whether they should live or not, which is inhumane - and immediately makes the movement of Antinatalism less credible (If it's premise did not strike you as insane right away).
Well, besides that, whining like this also looks gay as hell.