How do you know if nursing is for you?

I just graduated in May and have passed my boards. I worked as a secretary, tech, and a registrar for the last three years in a 65 bed ER while I was getting my BSN. It was a very stressful work environment, even though I had good nurses and doctors to work with I still felt unsupported and utterly disheartened about health care everyday I left work. I thought these feelings were due to the overwhelming stress of work, schook and bills, but I have since moved to a smaller hospital on a 20 bed telemetry unit and my feelings have only improved slightly. I work with a wonderful, supportive staff and the pace is much slower than the ER, but I'm still depressed. I'm two weeks away from being off orientation and there is all this stuff that I haven't finished...like the on-line essintials of critical care class I have to take, the EKG test that I've taken twice and failed, and the continuing education hours I will need to complete before the end of the year because none of the rest of the stuff they are making me do at work counts for continuing education. I guess my point is that while I understood that I was going to need to continue to learn even after I got out of school, I don't like feeling like I don't really have any free time even though I have 4 days off a week because I have all this stuff to learn. I don't see that issue is really ever going to change. I don't want to give crappy care or hurt someone because I'm not educated enough, but I don't want to continue to have no life because I'm spending so much time learning nursing stuff. This issue is stressing me out and I don't know if anyone else feels that way or if it is just me. Like maybe it is a sign that I'm not willing to put forth the effort needed to be a good nurse and therefore entered the wrong career...I just don't know.