There are so many cases now of mental illnesses and most of them are actually caused by a society that is individualistic and people have no way to air out there challenges and deep emotions of life. If people only learn to kneel down and go to confession instead of just lying on a couch and soaking themselves in emotions, there will be less mental problems in the world. This is the genius of our Catholic faith, it gives us confession. It actually provides an avenue were we can be released from personal burdens and allow us to be refreshed again. Confession is not for God but for us.
The goodness of confession aside from the fact that we are forgiven is the feeling of being accepted as who we are not as we should be.