What's a caregiver turnover rate?

I'm a caregiver at 2 different agencies and I do not like this job anymore. (I been a caregiver since 18 and I'm now 24) In my opinion, I love all the clients I've met over the past few months working at these agencies however, the pay is low for the amount of miles I put on the car and backbreaking work that I do. I'm currently about to put my 2 weeks in and work at an assisted living facility. Any other caregivers feel away about being underpaid? How long does a caregiver usually stay with an agency?