Sorry to burst your bubble but the sun appears to be to be the same size because of the distance make it look smaller.
This pic shows what we think are the sizes of planets and sun compared to each other.
Your theory is flawed because I could see a skyscraper in the distance and another person a few meters from me.
From my point of view they would have the same height because the distance make it look like it is.
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Your theory actually proves flat earth. If you could see the skyscraper in the distance at the same perspective, the earth would have to be flat. Otherwise you would begin to see the skyscraper appear to fall away from you as the earth would have curvature every few miles to accommodate a spherical model.
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Earth has a 12700 km radius, the difference on the surface is too small to notice. To see the earths curve you must multiple kilometers in the air. Further more we rotate along with earth and it's gravity making it impossible for buildings to crumble under influence of earth spherical rotation. The same law also applies is when you step into a train. You feel the force when you travel to the next destination until your used to it. After that you can freely walk trough the cabin without isues.