I always start to think about this when I go to the ocean. There's something about staring out at a horizon of seemingly never ending water that makes me feel so small. However when I take a second to look down at my feet, and see the little rocks and sand, it makes me wonder where I fit into it all.
I'm not going to look up all the facts here, but I think we can all agree that the atmosphere goes up a fair ways, followed by the rest of the solar system, and then whatever else is up there. THAT is tall. Or is it? But nonetheless, when you look at a picture of me next to my 6' friend, standing in front of the ocean with the skies in the background, I don't think it's reasonable to call me the short one, because that one foot between us isn't very significant anymore.
Sometimes though, I don't know how big I'm supposed to feel. I know that my worth isn't dependent on it, and maybe it doesn't even matter. But sometimes I want to know what I am to the existence of life, without comparison. Not compared to my 6' friend, or the ocean, or the galaxies, or the grains of sand. Just me, independent of everything else. How big my mind is, and how far my thoughts reach. Maybe it depends on how much of an impact you make in the world, or in other peoples minds. How is there size without comparison?
I'm not sure. I'm not trying to be self-centred, or completely single out myself from everyone else. These are just the things I think about, and sometimes all my thoughts just jumble together, and don't make sense, but that's okay.