afraid of (one's) own shadow
Easily scared; jumpy; timid. Everyone was surprised that Janice led the meeting with confidence, as she normally seems afraid of her own shadow. Please don't take my sister to a haunted house on Halloween—she's afraid of her own shadow.
afraid of your own shadow
If someone is afraid of their own shadow, they are very nervous and shy. She's afraid of everything these days — afraid of her own shadow. Note: Adjectives such as scared or frightened can be used instead of afraid. He used to be scared of his own shadow as a little boy.
afraid of (or frightened of) your own shadow
unreasonably timid or nervous.