In the context of the question, the comparisons made in 'By Myself' emphasize the individual's own feelings and experiences, contrasting with the broader and more aspirational comparisons of imagining oneself as a scientist, athlete, or president. This highlights a more introspective approach, where the speaker reflects on their own identity and emotions instead of projecting themselves into roles that are typically seen as successful or admirable. Understanding this difference can deepen one's appreciation for personal narratives and the significance of self-reflection in literature.