Sounds about right! :)
It's a tough job physically, and sometimes emotionally draining...! I loved working as a CNA when I did! Although I had a somewhat different experience than most. I worked dual roles, would flex a lot to other positions, and so on....so I never really got the usual CNA burnout.
I've found that it is definitely the type of job where you do have to learn your own way of doing things, and find out what works best for you...so when you were told you will 'get your own groove', it's true... No one does the job the same way, and to be efficient in the position you have to figure out your best way of doing things. Along with getting your own routine down and doing the different parts of the job at the times that work best for you. I mean you can't come into work at 630am, shower 4 people and still make it to the dining room by 730am when you still have 5 other people to get up and dressed and into the dining room for breakfast..lol. So you just have to find out what works for you...
Some days I would have 9-11 patients, some nights I would have 15 [and it would be a full moon, of course]! It was hectic and crazy sometimes, but there are also times when it is truly an amazing job. You meet some wonderful patients/residents, and get to know their families.. Occasionally you have a spare few minutes here and there where you can sit down and paint someone's nails or hear the stories from someone's childhood. Those moments are great!
You will inevitably come across coworkers that don't work hard, or do the right thing, or put patients in harm, it's a sad reality of the job... In my area the pay can be really good, and the education needed is low cost and short term, so a lot of people get into it not really knowing what they are in for. So in turn they don't last or don't do a good job.
These patients and residents depend on you for their everything...! Ultimately you just have to remember that you are caring for people, and they deserve to be treated with respect and dignity...and if you can't do that for them...then it isn't the right job for you! [not you OP, just 'you' in general]