If all of you want to become a doctor and don't get in the first time, second, or third time, why give up the dream of working in a clinic or hospital? There is nothing with becoming a PA, nurse, or another healthcare professional.
A nurse can do a lot in the healthcare professional. I'm sure a PA can teach, do research, and manage patients under the supervision of a doctor (in fact, I know this is the case. When I worked at a hospital for just over four years, there were a few PA's who were the first person to see the patient and than they would counsel with the MD and than the MD would see the hospitalized patient for a few quick minutes to give the final management information).
If you can't stand the idea of being the second guy as a PA or nurse, you are in for a ****ty life when you are at the near bottom of any company you would work for with your chemical engineering job, teaching job, or a research scientist. Most of you will be a subordinate the rest of your life if you work a job outside of medicine.