I always hear people say "oh well we're self-destructing species living on a tiny rock in the middle of nowhere, therefore we're insignificant."
Sorry, but you're wrong. It seems like the only argument here, is that we're small in size. Yea, that's true, but it has nothing to do with us being significant or not. You seem to take for granted all of the stuff the human race has accomplished in spite of our violent nature. The fact that we were able to defy earth's gravity and send humans to the moon is a tremendous achievement. Imagination and abstract thinking exists nowhere (as far as we know) except on earth. The universe is self-aware because of us. We can look at galaxies which are billions of light-years away. The mere fact that you can sit at your computer in a vegetative state drinking soda all day is fairly significant. Where else in the universe do you think that is happening?