Well the thing is that the hand I've been dealt in this life wasn't really bad at all. Sure, some aspects of me suck a bit and I can't do a lot about it, like for example I'm not the most attractive person around, but on the whole...
I've been born in a rich country in the first world, I would've had access to all the higher education I wanted practically for free, I'm white, I'm a guy, my parents were kinda well-off middle class, they never abused me, I am in good health physically, I am far from Einstein but I'm not hopelessly dumb, the majority of people in my extended family are really nice and supportive. And so on and so forth.
If I managed to fuck that up, what would I do with all the possible worse lives that I could've been born into? I don't think I'll get a better one if I reroll.
I don't agree that our world and humanity is awful though, as some have said. I think humanity is awesome and the things we have accomplished are really impressive. And I would really love to be a part of it, I just can't seem to do it.