I am 70 now. Have been depressed most of my life but didn't know it. Family said I was just lazy or faking. Even though my sister had panic attacks and was depressed (I considered her the only normal one in the family, " her "symptoms were genuine. My problems were all in my head - DUH yes they were.
My father always blamed me for being the screwball in the family. He had severe anger issues. My mom had agoraphobia(we didn't know the name then) and panic attacks which she said were caused by her iron pills.

. My sister's two daughters both had panic attacks. Gee I must have infected them - like chickens bringing Black head disease to turkeys.
Every one including family doctor said i should just "pull myself together," "think happy thoughts," and stop dragging everyone else down. At one point when my sister was having her acute depression, she said she couldn't talk to me because I depressed HER so much.
People don't WILL themselves to be depressed anymore than people choose to be diabetic, or have thyroid trouble.