I experience chronic depression everyday and it says from a countless number of sources that depression shrinks the brain.

They say that this shrinkage can cause even more psychiatric problems. This information disturbs me and I wish to know that if in the future my depression gets worse, is it due to the fact that my brain has shrunk (for example, the shrinking of the prefrontal cortex)?

And will this shrinkage cause me even more depression? Has it been proven that brain shrinkage will cause you more depression if you already have chronic depression?