The answer is, of course, we have no way of knowing anything about your eyes, so please see an eye doctor.
I think everyone sees what you see at some time. I see the little round "cells' that you describe, they remind me of looking at cells under a microscope. I also have 'floaters" which is actual eye tissue that has broken off and is casting shadows on the retina. Sometimes this can be caused by a very serious condition - a retinal tear or detachment.