Radiography and nursing share some of the same prerequisites and core classes so all is not lost. I just looked up your school and it does offer a nursing program. Drop your radiography major, take all the nursing pre-reqs, excel in these and you won't have a problem getting into the RN program. You will need a BSN down the road but there are many options for that later on. Do what you can right now to get into a nursing program and get the best grades possible. Good luck.