Attacking self-defeating/negating thoughts is a lot of work. Breaking down strongholds in our minds is just as difficult..but doable.
Yesterday I was driving behind a female driver, who was smoking a cigarette. It was freezing cold and snowing but she had her hand out, smoking the life out of that cigarette. A few minutes later, she flicked the cigarette stub out the window and onto the road. A few seconds later, her hand was out the window again, with a newly lit cigarette..

I share this observation to say this "fast" is really a blessing...