"You may want to smash a painful emotion to bits, but you can't blow it up with a nuclear bomb," wrote Tsoknyi Rinpoche in his book Fearless Simplicity.
What makes the situation even more poignant is that the painful emotion may be based on a wrong interpretation of experience. It may also be caused by some faulty conditioning that got imprinted on your sensitive psyche when you were a toddler.
Having said that, Cancerian, I'm pleased to inform you that you currently have the power to significantly dissipate the intensity of a certain painful emotion you thought you'd never shake. To initiate the process, invoke forgiveness in every way you can imagine -- toward those who hurt you, those who ignored you, those who misled you, and you yourself.