IMHO it's important to honor your parents, but in the end, you live your life, they don't.
I went to school when I wasn't ready and studied a subject I wasn't really interested in and was bored beyond belief. I ended up dropping out. Now at 26 I am going back to school to get my LPN and persue my dreams of eventually getting into CRNA school. It's a long road ahead, but I have a lot more life experience now than when I was 18, and I know what I want and where I belong.
No offense to you, but I wouldn't want to have a nurse treating me (if I were in the ICU) who didn't really want to be a nurse to begin with. On top of that, unless you are a great actress, they will recognize that when you go to interview for CRNA school.
I know what it feels like to be doing a job that you aren't into, and going to school for a subject you didn't want to study. Both bite the big one, so to speak.
I really hope you make a choice that you will be able to live with, and not just a decision to placate your folks. They love you, and even if they are pushing you into nursing, I am sure they would rather see you do something you enjoy rather than be miserable.