How would you explain the last stanza in "The Average" by W. H. Auden?

The poem "The Average", by W. H. Auden, depicts the sad
story of a boy who was raised up by his parents to be more than they were. Lost and
having failed to find the success his parents desired for him, the "shy and country
child" suddenly realizes that he will not be able to find a "smart profession" and "grow
rich."

In the last stanza, the boy suddenly realizes that
he can never escape his shadow. The shadow represents who he really is. No matter what,
a person can never escape their shadow.

Therefore, the last
stanza shows the boy's recognition that he will always be average, no matter how fast he
runs. Not finding himself worthy, "no sensible career was good enough, / Only a hero
could deserve such love," he tries to outrun the fact. Unfortunately, the boy's
understanding, that he is who he is, far outweighs the fact that he will not be able to
live up to the expectations set forth by his parents.