Worst case scenario thoughts

I have a habit of thinking the worst about the circumstance and then I get a jolt of relief when it doesn’t happen– a giant, very gratifying “phew.” It’s a pattern, I now see because of my work with the Model. On the flip side I have a visceral repulsive reaction to creating positive thoughts. I am working on being comfortable with positive thoughts but it’s very difficult. I’d rather get the positive jolt of relief when the worst case scenario thinking doesn’t happen (it never does) then face the possible disappointment of the positive thought. My T line is usually worst case scenario. my F is usually fear, my A is usually gathering evidence to disprove the worst case scenario thought, the result is this sense of relief. Maybe ladder thoughts might help? Maybe I am using the model wrong?