"well, i kinda made the assumption that everything would grow proportionately with their weights/masses/other physical properties fully proportionate to their height.
So that deals with the first rediculous point."
That assumption is totally wrong. And completely impossible: If you double all the dimensions of a cube you will multiply it's volume by 8, if you want to double all the dimensions AND have the volume only doubled you have to completely change the shape.
"it would be noticeable if the other physical properties remained constant, but if everything changed proportionately at once, it would be impossible to notice. "
WRONG, if you doubled your length width, height, etc. etc. you legs would break because you would NOT have doubled your volume you would have multiplied it by 8, it is not possible to double lengths and only double volume because volume = length * width * height.
"but you don't know how things work when you turn your back to them, do you?"
Errrr, yea we do, they work the exact same way when we are facing them. Besides you did not address the point, IF as you are suggesting our senses are totaly misleading us, and all our theory is wrong, then nothing we built based on our theory would work; planes, cars computers, etc.
"you are missing one thing: all realities are conformed together by the ideas of language and the arbitrary labelling of objects. Is the sky blue if you don't know what blue is? "
The fact is that people see the sky as the same colour as light of 450 nm, if reality was subjective then why exactly does EVERYONE see the sky and light of 450 nm as the same colour?
"The reason why people can replicate experiment's results is because they are trained to see things a certain way, so they look for the one thing in one of two states (or multifarious measurements) and just check that when they see it. "
OMG what nonsense, in science experiements are often DOUBLE blind, meaning the people looking at the results have NO IDEA what they are evaluating, it eliminates the possiblity of biased results. If i drop a stone and measure it's acceleration towards the ground, i will get a value of about 9.81 ms^-2, anyone anywhere on Earth can repeat the experiment and get the same answer, there is not any "seeing things a certain way" here, people are simply measureing the acceleration. IF reality was subjective they would NOT get the same results, yet they ALWAYS do.
"Why do you think we exist in reality?"
Facts exist, I am sitting typing at my computer right now: fact, i am NOT sitting on a beach in Barbedos: fact. Reality exists.
There is no alternative to us existing in "reality", even IF everything we see, is an illusion (which is stupendously improbable) , even if all theory is wrong, we STILL exist in reality, something must exist for us to be aware, heavens, Decarte realised that much hundreds of years ago!