Some people think mental illness is a matter of mood, a matter of personality. They think depression is simply a form of being sad, that OCD is a form of being uptight. They think the soul is sick, not the body. It is, they believe, something that you have some choice over.
I know how wrong this is.
When I was a child, I didn't understand. I would wake up in a new body and wouldn't comprehend why things felt muted, dimmer. Or the opposite--I'd be supercharged, unfocused, like a radio at top volume flipping quickly from station to station. Since I didn't have access to the body's emotions, I assumed the ones I was feeling were my own. Eventually, though, I realized these inclinations, these compulsions, were as much a part of the body as its eye color or its voice. Yes, the feelings themselves were intangible, amorphous, but the cause of the feelings was a matter of chemistry, biology.
It is a hard cycle to conquer. The body is working against you. And because of this, you feel even more despair. Which only amplifies the imbalance. It takes uncommon strength to live with these things. But I have seen that strength over and over again.