A few years ago, I installed a light switch incorrectly. So, instead of flipping the switch up to turn on the light, you had to flip it down. Rather than changing the switch I told myself that I would eventually remember that for this one switch, down, in a sense, was up. That was three years ago and I still keep forgetting!
The problem was that my new switch went against all the other switches in my house and therefore my brain was constantly being reinforced by the old, established habit of switch up, light on.
If your brain is constantly being fed information that supports the insecurity-driven thinking of emotional struggle (doubts, fears, and negativity), then isolated attempts to be more hopeful or optimistic, just can’t compete. Not unless you engage in a systematic process of extinguishing all the faulty thinking “switches” that reinforce and anxiety and depression.