Mediocrity or less

Today I was given my “file” the compilation of reports and tests my pearents have been collecting throughout my life.
From my hospital records as an infant up until my secondary School education. After reading this small collection of data I have discovered a truth.

I am on paper below average, in most cases in the lowest third percentile.

I was honestly dumbfounded, and yet in a quick overview of my current self I have realised I have remained in the same category of “below average” in to my adulthood. It’s devistating, and yet somehow I have made myself comfortable with less then mediocrity. The question now is what do I do with this revelation?