You're not alone... I worked as a PCA at a private home for 2 years providing 1:1 care. After earning my certification, I was hired at a LTC facility, which sounds similar to the one you are working at. There a 20 residents, and 2-3 CNAs on at a time.
I have worked as a CNA for 3 months now, and I am finally comfortable at work. I do a great job, the only problem is... I am slowwww! It takes me about 40 minutes from start to finish to shower a resident, and it only takes the other CNAs 15 minutes, tops.
Just remember, your co-workers have probably been at this facility, or worked as CNAs, for a few years. After a while, I am sure you'll be just as quick as them. As long as you are getting the job done correctly, and providing safe, private care to the residents, I am sure you'll be fine! :)