Teenagers have limited capacity for cognition and thinking, so they easily despair and get frustrated. Teenagers' depression can be neglected as a natural phenomenon 

that can occur during adolescence. Depression is the disorder of memory of emotion. Men do not store negative emotions in the memory, so men's depression is more like 

a neurotic disorder, which is more related with perception than with memory. Only women develop depression due to the change of feelings. Teenage girls' depression is 

the disorder of memory of emotion. Depression occurs to block the memory of wounds or negative emotions until the unconscious treats wounds. Depression is a safety 

device that prevents wounds from expanding further. 

     Teenage girls develop wounds in mimind when things do not accord with their own thought standards in the process of forming self-identity. For example, when a 

teenage girl wants to become a violinist but her parents force her to study to become a doctor, stopping playing the violin and studying to become a doctor become wounds 

in her memory of emotion. These wounds are accumulated without being recognized in the conscious. The unconscious in mimind not only protects but also treats mimind. 

The unconscious retrieves and treats wounds one by one, but it cannot treat properly when wounds continue to be retrieved or are retrieved all at once. Then, it decides 

to put a seal on wounds stored in memory, and this state of psychology is manifested as depression.