Hi, Brittany,
Congratulations on your excellent grades. Keep up the good work!
This will get you started in understanding psychiatric nursing:
http://en.wikipedia.org/wiki/Psychiatric_nursing
You might Google "psychiatric nursing" to read more about it. It's basically helping people with mental illness, and there are many, many of those--depression, bipolar disorder, substance addiction, dementia in the elder population, etc.
Getting a degree in psychology and getting a degree in nursing are two different things. Many people get undergraduate degrees in psychology as a stepping stone toward a graduate degree in psychology to become counselors or social workers. Nurses have degrees in nursing. They may have degrees in other fields (like me), but still have to have nursing degrees to practice nursing (unless you train to work as an LPN).
As fields, psychiatry and psychology basically are different, too. You might want to research those differences. I won't get into it here because I'd have to write volumes.
I'm a student nurse getting ready to graduate in May, but I'm older--old enough to be your grandmother, I guess.
I hope you'll get more info off your post. If not, send me a private message and I'll gladly answer any questions you have. I'm inquisitive, too, because I like to have as much information as I can find about something before I get involved in it!
Linda