Corrections, like psych, is often best entered after some more generalized nursing experience. The big thing with those two specialties is, as someone else here pointed out, you can't show fear. And when we are new nurses, we are all inherently fearful because of our inexperience.
Plus, your assessment skills have to be pretty top-notch as your patients often may not be the most truthful...
Side note: congratulations on becoming a nurse!