CNA - needs attitude adjustment and encouragement

I need help understanding my job,
I'm having a really difficult time being a CNA where I work. The people I work with have always been very flexible and accommodating. I like the adminstrative staff, the nurses, the other cnas and the residents. I, however, now, for four hours of my 12 hour shift have 20 people. I have 13 - 16 (helping other aides with those residents that need more than one aide) for the rest of my 8 hour shift. I HATE MY JOB. I am not a CNA to give inadequate care and hurt myself. I hurt when I get off work. I feel like bawling. The residents see what is going on and think that they can't ask me to help them because "I am too busy".... but, that's my job! I want to help, but I can't do anything more than take you to the toilet and RUN out your door. I am so perturbed.
I don't want to leave because I am a good aide and will do better than the new person they hire to take my place. However, I don't want to work in this environment. I wouldn't send my child to a daycare where she was neglected because they had either taken on too many kids or they wouldn't hire enough staff.
I always go in. I have filled in on numerous occasions. I am just frustrated. I work so hard. I care. CNA's are dime a dozen, though, so who cares, right????
Ugh, do I need an attitude adjustment or do I need to find a new job? I've spent the last 7 mos or so perfectly happy there. But why are they suddenly so OK with slaughtering their employee moral and putting the residents at risk?
The Bottom Line.
My rant is over. I'm dedicating myself to changing my attitude.