How hard is nursing school really?

I am fairly positive that I want to be a nurse. My dad is a doctor and I am in CNA school now to get experience. I love healthcare and nursing seems like the profession for me. However, I constantly hear from girls in the program about how it's "soooo intense" and completely kills your social life. I am used to studying hard, but they make it sound like it's just as hard as med school!! I realize that I will have to cut back on my partying quite a bit so I can focus on nursing, but I still want to have somewhat of a social life!