I'm probably far more educated and intelligent than you will ever be.

https://scitechdaily.com/scientists-find-no-evidence-that-depression-is-caused-by-chemical-imbalance-or-low-serotonin-levels/

https://theconversation.com/depression-is-probably-not-caused-by-a-chemical-imbalance-in-the-brain-new-study-186672