You'd be surprised...also the whole problem is its not our choice and in our control at least not to everyone who suffers with it. Depression isn't a simple matter of just having unhelpful reactions, habits and negative thinking...at least for me it isn't. If depression was my choice and something in my control I would not consider myself to have depression...having depression to me means I am not in control of my mood much of the time, sometimes I feel like absolute crap even if I spent my day trying to be positive and see everything through rose tinted glasses like those people who run those workshops sound like they'd expect one to do. if I was 'in control' I don't think I'd still suffer from suicidal thoughts/urges over feeling like crap due to my mental state.