See a doctor. After dealing with undiagnosed bipolar, PTSD, and major depressive disorder for 40 years I had a meltdown on Labor Day. I survived, found a great psychiatrist, and got medicated.
Depression is a state of mind that you have to work hard to find. You cannot be depressed if you don’t want to be. You have to really want it badly to ever get it.
I disagree with you on this. My moods range from extremely elevated (manic) to extremely depressive. I have zero control over these cycles, all I can do is hang on when I feel them coming. I didn’t choose to be so depressed that I second’s away from killing myself. My therapist told me to take a walk. Yeah, it’s an actual chemical imbalance so walking really doesn’t help.