True, AAs aren't established and still a primarily new profession. But everything has to start somewhere. I think what pushed me towards pursuing this profession instead of medical school is that you still have a degree of autonomy. But you work as a team with the MDA to figure out the best plan for the patient. At least that's what I see with our CRNA/MDA model.
I think you just had a few comments thrown at you that sounded like all people view AAs this way. At the end of the day, be happy with your career that you chose. Not what others think.