what if

you went through life, not knowing .. its kinda difficult to express,
Let me give an example ..
when we were Kids, Lazy summer afternoons .. u lie down and stare at the clouds .. and not really focussing on anything .. and you see these uni cellular things floating on you eye balls . . they are so very difficult to focus on .. as soon as u try an see them they swim away .. I never gave it much thought and when I did, never thought that everyone sees them and realises them to be what they are ..
that our Eye acts as a Microscope .. a combination the focal lenght of our lens and the eyeball on which these organisms float ..
I happened to read about them and realised that its the same with everyone else .. what if I had not come across that piece of writing? what if I had gone through the rest of my life thinking I was the only one seeing them?
Are there other things that I am not aware of ? This is not common sense .. or even General Knowledge .. How do I know that when I see the colour Red .. others are seeing the same colour ?
what about the voices in my head? Just because I hear them, and I have not read that others dont, does that mean I am all on my own ?
What is I spent my entire life knowing things, thinking that that's how everyone knows it to be .. and be wrong ? and that others see it in an entirely different way .. and each of the others actually sees it in a unique way .. not knowing that the others dont share it at all ..
am not coherant .. and dont think I have been able to put forth what I wanted to .. but then again .. I dont think I can ....