What is the extended metaphor of the song "Part of your world" from the little mermaid

The extended metaphor used in this song is related to the cultural rift between humans and mermaids which can be compared to our society today. The humans and mermaids have completely different lifestyles. This compares to people in this world that are completely different, like Christians in America and Buddhists in China. Ariel exemplifies her personal experience with the cultural rift in her song where she confesses her desires.