We are really small.
I’m not comparing humans to the vegetarian members of the clade Dinosauria, some of whom were more than 10 time larger than we. They were larger because vegetation was more abundant in an era of greater CO2, which we know from watching pot farmers use CO2 rich atmospheres to grow their marijuana bushes.
I’m looking at the size of the earth, 25,000 miles around, 8,000 miles in diameter. We are tiny specks on the surface. Our biosphere is infinitesimal. Our comfortably breathable atmosphere is less than three miles up, and our ocean’s average depth is a little over 2 miles. On a planet where the center is 4,000 miles down. We are on a skin that is orders of magnitude thinner than the shell of an egg.
So why are we so small in these circumstances? Because the physics of our biological systems combined with our food supply limit our bone to body mass. Elephants and others are larger than we are, but they were not adapted to eating other animals, as we are. Carnivores have to move a little faster to eat. The same is true for many ocean species. But again, gravity doesn’t limit ocean creature's size as much as it does ours because they have an offsetting buoyancy.
These physical limits don’t bear on the structures we build. Several other forces do.
The combination of gravity from our planet and wind speed in hurricanes, earthquakes and tsunamis do.
We live in/on this very thin biosphere where temperature differences create wind storms along with water in the atmosphere that have always limited the size of protective structures we could build for shelter.
The most significant factor, until the last century, has been the earth’s mantle which includes in it a molten rock that regularly excretes and exudes through our 5 mile thick crust in the form of volcanoes and earthquakes.
The combination of high wind speed and earthquakes have limited the height of the buildings we construct and keep them in proportion to our own human size. As we get better at using materials our structures are getting bigger, taller and heavier.
We are still tiny, relative to the planet we live on. Other than modern commerce and communications, which are not visible, nothing human can be considered large.