In my books I refer to people who try to side-step or avoid life and life challenges, as Turtles. When life becomes threatening, turtles (actual turtles and human turtles) pull themselves into their protective shells.
In order for any behavior to be considered “turtle-avoidant,” it must be an attempt to avoid some aspect of life in order to feel more in control. As a general rule, any excessive/compulsive behavior should be questioned as a possible deflection or avoidance of life.
Here are a few common avoidant-turtle examples: emotional withdrawal; social isolation; shyness; Internet overuse; compulsive eating; use of alcohol and other drugs; gambling; overworking; excessive or compulsive pursuit of a hobby; excessive TV watching, smart phone compulsivity; hypochondria (illness-focused withdrawal).