CMA need same pay as RN

i am the only CMA where i work. there are about 8-9 nurses. For some reason, all of them think they are better than me just because they are nurses. in fact, i do most of their job. They get paid 30-40hr while i do most of their work for less than half that. I asked for more money, but my reply was "the nurses have to use their brain more" Then i started thinking of going back to get my RN degree. The minute i said something, all the other nurses "all of a sudden" wanted to go back to school. This made me think that they are trying to compete with me and not be equal to me. Most of them are lazy and really dont respect me. Whenever i have a problem with one of them, the NCM does not have my back. But believe me, she has theirs. I do know that there are other reasons why they do that i dont wish to get into. So i have decided not to express any interested of going back to school-at least to them. I have decided to be an ultrasound tech.
Anyway, I just think just because nurses give meds and CMA dont, we should get the same pay. I know that many people would disagree but thats my opinon