Welcome to the forum Lyndsea. We are glad that you found us.
I earned an AA in psych before going to nursing school, and it never made me any more marketable. In fact, no one has ever asked me about my AA or even cared whether I had one. I also have a BA in History, and while having a four-year degree may have made me a little more attractive to some employers, none of them cared what my major had been. If you ever decide to earn a graduate degree, then you should choose very carefully, as your choice of majors will be very important to future employers, but you are not there yet, so, let's move on.
Do not expect the psychology classes you take to earn your AA in Psych to make you a better clinician. You will learn some very interesting things in classes that are broad, general surveys of psychological theories and history, but no clinical skills.
O.K., now that I have been a total downer, let my offer some good news. Knowledge is NEVER a waste. The more you learn about anything the better you will be able to learn more in the future. Our brains never "fill up." The more we learn, the more we expand our capacity to learn in the future. Since you are so close to accomplishing your goal, and changing majors now would probably delay your entrance into nursing school, it might be best for you to carry on to the end and enjoy the satisfaction of achieving what you set out to do. What I would suggest is that while finishing your degree, take as many classes in hard science as you can. This is a great time for you to learn as much anatomy and physiology as your school offers. Study biology, microbiology, physics and chemistry, to the extent that you can. Be sure to take some classes that involve "bench science," that is, classes that require you to go into the lab and engage in some simple experimentation. Oh, and by the way, my junior college offered a class in neuroanatomy and neuroscience that I found valuable later as a nurse. Does yours? I think that these classes will do more to prepare you for a clinical career than any psych classes your school offers.
Remember, I was a psych major too, and I do not regret it, so I am not being critical. However, after 30 years of nursing, I have found that my education in the hard sciences has contributed far more to my success, and my value to my patients, than any of my psych classes did.
Be well, and good luck! You have an amazing adventure ahead of you. Please let us know how things go with you.