Emily Bronte's poem "I Am the Only Being Whose Doom" expresses themes of loneliness, unhappiness, and disillusionment with humanity. Through metaphorical language and personification, the speaker conveys feeling isolated and coming to realize that even within themselves they find the same flaws as in others. The poem has an ABAB rhyme scheme and uses literary devices like paradox, metaphor, and personification to develop these somber themes.