From my experience, as a newbie and then later as an experienced nurse, orientation/training days are few and far between. I've had some jobs where the training was a couple of days and then I was on my own to having some where the training consisted of a nurse showing me where the med room was, handing over the keys and leaving me on my own. Long term care is tough because you have a big caseload (usually skilled with g-tubes, etc) and you have to figure it out as you go while still making med passes on time, overseeing CNA's, and getting your paperwork done within your shift.
If you don't feel comfortable, it's alright. Be honest, but calm, with your DON and ask if you can shadow a nurse on the following shift or on your day off to help increase your confidence. Unfortunately, the best way to get more comfortable is just to do it. But be safe and speak up when you need help or have concerns/questions. Good luck!
FYI - there are always good facilities and bad facilities and many in between. Try to stick with yours as long as you can and keep looking for something better.