Well you're right in that we have constraints based on
  stereotyped patterns of behavior and thinking that we've grown
  accustomed to.

  How much we're born with / how much we're made of course is an
  open question, but it's a matter of degrees.

  I have a basic temperament. I have tendencies to think or act in
  certain ways, based on my biological limitations. I'm 1/2 deaf
  and 1/2 blind, born premature, yet nobody would know any
  different unless I told them.

  Other biological limitations on how my brain is constructed may
  have to do with cerebral palsy. [they said I have it, and as a
  child they worked on my brain plasticity to overcome it].

  I don't know if I had it or not. There's no way to tell unless
  they scan my brain and find a few spots that got re-routed,
  buried deep within somewhere. [probably around my amygdala
  somewhere I suspect].

  So "willing yourself" has limitations. But not insurmountable.
  Just takes work.