What is an example of "internalizing problems" that results from overcontrol of emotions in early childhood?

The examples are "Anxiety and depression".

Internalizing behaviors are those negative practices that are centered internally. They incorporate frightfulness, social withdrawal, and physical grievances. As opposed internalizing behaviors, externalizing practices are coordinated outward toward others. Harassing, vandalism, and illegal conflagration are cases of externalizing behaviors.

the minoan civilization flourished in the middle bronze age on the island of crete located in the eastern mediterranean from c. 2000 bce until c. 1500 bce. with their unique art and architecture, and the spread of their ideas through contact with other cultures across the aegean, the minoans made a significant contribution to the development of western european civilization as it is known today. labyrinth-like palace complexes, vivid frescoes depicting scenes such as bull-leaping and processions, fine gold jewelry, elegant stone vases, and pottery with vibrant decorations of marine life are all particular features of minoan crete.  

so basically their unique way of ding arts, as well as architecture.