I don't know if this post will help or not.
Since you are only 21, I am going to assume here that nursing is your first, real, I'm-working-because-I-have-to-not-because-I-want-to, this is a career..not a hobby, job.
It's a rude awakening...I remember the very first job I had when I moved out of state, totally on my own. It's hard to deal with the day-to-day issues of working, the politics, the customers, clients, patients, whatever the source of revenue. Sometimes I would come home and just cry and think that I couldn't go back.
So, I THOUGHT that changing jobs would fix it...and it didn't. I thought that changing careers would fix it...and it didn't.
That was when a light-bulb went off over my head and realized that it's why they call work, WORK. That is what it is, work...and like any work...most of it is hard as most of us in life want to work at the highest level we possibly can for our level of education in order to secure the highest income possible.
Two years in a hospital is not a long time to have been in all the departments you have...I have seen alot of posts here from nurses (and I am not a nurse yet, I start this fall, but I have a very long work history)..where you are usually working in a DEPARTMENT for a year...before you really feel like you know what you are doing.
It's something to really think about.