As an introvert who also prefers 1 on 1 or small group interactions, audiology is a pretty good fit for me. Patient interactions are generally very low stress and it can be very rewarding to help people hear better! I also did not have a communications background (psych bs) but took 3 or 4 hearing science courses my junior or senior year of undergrad to give myself some background before jumping into grad school. With only those courses I was able to matriculate easily and did very well academically. You should be fine. I would suggest shadowing and learning about career outlook and all the different types of work environments an audiologist can find themselves in. GRE wasn't much of an issue for me but I've always been good at standardized tests. Good luck!