afraid of one's own shadow
Very timid and fearful, as in Richard constantly worries about security; he's afraid of his own shadow. This hyperbole has been used in English since the early 1500s, and some writers believe it originated in ancient Greece.
Words nearby afraid of one's own shadow
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.