Frustration
The condition of being prevented from reaching
a goal by events that are beyond your control is known as frustration. As a
psychological construct frustration is an affective reaction set out by an
individual, this is due to the interference of one’s supposed to accomplish a
task, objective or aim. For example, you were scheduled and, wanted and
supposed to travel tomorrow to some country but it couldn’t happen because of a
storm or an accident which caused you to be disappointed because you were very
excited and expecting.
Answer:
The narrator is saying that they used to think the world was some magical place with no flaws, and then they realized it was otherwise.
"Or would I leave her be naïve, to keep having fun?" The narrator is going back and forth between leaving themselves innocent, so that they can enjoy it while it lasts.
The author is considering this because "I would give up everything I have, to view life through her eyes again." As a child, she was innocent, and loved the world, and is wistful to feel the same way again.
Hope this helps :)
<em>Stay Cold,</em>
<em>Brook</em>
He could mean that the place looks neglected / abandoned.