How do emotions play in the story "Araby"?

The unnamed narrator is at an age where his whole life is governed by emotion. As a young boy on the cusp of adolescence, he's experiencing all kinds of strange emotions—such as his attachment to Mangan's sister—that he doesn't really understand. But he acts on them anyway, seeing them as providing a brief respite from his boring, humdrum existence.
Emotions are exciting, liberating even, but they're also notoriously difficult to control. The young boy finds this out to his cost when he's crushed with disappointment after arriving at the bazaar, only to find out that it's closing down. He's been led by his emotions right throughout the story, acting in ways that perhaps he ought not to have done. But there was nothing to hold him back from doing this, no center of stability in his life that could've provided him with moral guidance. The boy may well be a victim of his overactive emotions, but that's only because his home life hasn't provided him with the kind of emotional support that a young lad of his age so desperately needs.

This story is really all about the narrator's feelings. He feels himself to be in love with his friend Mangan's sister. He absolutely idealizes her, and he comes to think of himself as a sort of heroic figure, carrying his love for her.  He says, 

I imagined that I bore my chalice safely through a throng of foes. Her name sprang to my lips at moments in strange prayers and praises which I myself did not understand. My eyes were often full of tears (I could not tell why) and at times a flood from my heart seemed to pour itself out into my bosom.

This young boy feels so deeply that, when Mangan's sister expresses her interest in the Araby bazaar, he can think of nothing but of going there and purchasing a gift for her. He gets permission and makes his plans, but nothing seems to go his way: his uncle gets home late, the trains are delayed, it costs more than he expects to gain entry, and then there is nothing there any more exotic than an English tea set. The narrator has a terrible epiphany. He realizes that what seemed so important to him—his very big feelings for this girl—mean nothing to the big, dirty, money driven world.  He recognizes the vanity of his hopes, and his feelings seem to turn to ash.