What are we?

Look around you. What do you see? Walls? A television? Trees? Tell me something: How important do you consider yourself? Probably rather important. Now, think of how your importance compares with the Universe. Now do you feel important? You know, some people think they're really important-- arrogant people. But think about it... If you were to just fall off the face of the planet, would the Universe be completely altered? I know someone's life would be changed forever, but would the rest of ours' as well? We're so minuscule that I don't think everyone's life would be effected. That would just be insane... Wouldn't it? Should we really think we're so incredibly important or should we realize that we're just specks of nothing in giant space?