How do you interpret the last 3 lines of “The Love Song of J. Alfred Prufrock”?

The last three lines of the poem unveil how dangerous it is for a person to live in a world of fantasy without even one real human relationship. Prufrock states that humans often time live outside of the real world, a place (environment) where we cannot really exist, "we have lingered in the chambers of the sea/ By sea-girls wreathed with seaweed red and brown." Eliot's use of the word 'we' denotes that we as readers are being equated with Prufrock. No one can live in the sea, and no one can truly live with without at least one real relationship. A relationship in which one other person has really seen who we are because we've shared ourselves with them.