powair-
so you believe in objective reality,
but describe one's perception as subjective reality...?

and how can you not change/control your perception?
your brain can only process x amount of data it receives
in a given day.
so if your thoughts and actions are constantly processing similar things,
it would seem as if you cannot change your perception, but if you become aware of other things in your life that your brain just wasn't processing before, there is a way to change your perception