No, you're handsome, remember.
The thalamus is the switchboard. The hypothalamus is in control of homeostasis. the limbic system is emotions headquarters. The frontal cortex is executive decision making. The best measure we have of this question to date is the fMRI, and that gives qualitative results not quantitative. We probably use all of our brains, but we're surely not using it all, all at the same time. Probably when it is most used would be during the first two years of life because of the growth factor. A more succinct question would be how much of our mind do we use. I would guess about 5%. Now you're into a more cognitive science (concepts regarding capacity of intelligence) realm, or philosophy. Such as Descarte's mind/body dualism, Spinoza or Kant, they all had theories about where thought comes from and opinions about constructs of the mind. Still, no one really knows.
Descartes spoke of the mind as an immaterial thing that moves a material thing i.e.brain/body.
Plato said (allegory of the cave) that man doesn't even have the capacity to perceive reality.
Spinoza said that our emotions are in the way of completely rational thought i.e. "man's insatiable DESIRE to control and possess".
Carl Jung said that the thoughts of all of our ancestors is deeply embedded into our subconscious, and this we respond to even more than the immediate world and our senses.
We know we have certain glitches in our processes i.e. "stroop effect"
or
Intentionally forgotten information remains in memory at essentially full strength, as measured by
recognition and priming, but access to that information is impaired, as measured by recall. Given that
pattern, it seemed plausible that intentionally forgotten information might have a greater impact on
certain subsequent judgments than would intentionally remembered information. In 2 experiments,
participants cued to forget nonfamous names were subsequently more likely to make false attributions of
fame to those names than were participants instructed to remember them. These findings implicate
retrieval inhibition as a potent factor in the interplay of recollection and priming in memory and
judgment. They also point to possible unintended consequences of instructions to forget, suppress, or disregard in legal or social settings (E.L.Bjork&Bjork 2003)

The name of the article was "Intentional Forgetting Can Increase, Not Decrease, Residual Influences of To-Be-Forgotten Information" in the Journal of Experimental Psychology

It also said that the forgotten memories influence everyday behavior more than the remembered ones. But E.L. Bjork is the head of cognitive psych department at UCLA and just as sweet as can be.

In short, the mind is complex and man is ignorant in more ways than he will usually admit to. But it's easy to forget about.....

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