How does the Ancient Marriner symbolize the feelings of guilt and loneliness in "The Rime of the Ancient Mariner"?

In Coleridge's "The Rime of the Ancient Mariner" guilt and
loneliness are symbolized most notably by the figure of the Mariner
himself.

He is cursed for the rest of his life to wander
and, when the urge and pain come upon him, to stop whoever he is directed to stop and
tell his story to that person.  There is no one else like him, and the obsession to tell
his story is beyond his control.

His guilt of course comes
from his killing of the albatross, one of the creator's creations.  As the Mariner tells
the wedding guest:

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"He prayeth best, who loveth
best

All things both great and
small;

For the dear God who loveth
us,

He made and loveth all." (lines
614-617)

This is the lesson
in the tale the Mariner tells, and is doomed to tell.