I have issue with the "come off".
What a peculiar (and awkward in itself) idiom!
How about a rework:
"There are times (they occur more frequently than not) that I find myself extremely nervous and unsure. At those times my post can give the appearance that I am of an awkward nature. Although, that is not truly the case."

"I am certain there is too much certainty in the world" -Michael Crichton