I speak with confidence because I have considered the facts, evidence, reason and objections to God, to Jesus, to the Bible, to the revelations given to many saints, to the claimed miracles, and to the alternatives to God ---- virtually all of my life.
I come away certain that Jesus Christ is who He says He is, all other religions fall far, far short of the ultimate truth, and that hell is as horrible as any man can possibly imagine. The Catholic saints I have read about have validated their life and their words via many different meassures, including miracles performed. Given all of the above, there is no reason in the world I should doubt their accounts of hell as well. So to answer your question --- Yes, that is definitely my belief of hell, to the point of it frightens me greatly I am so sure it's true.