I'm going to be honest with you - I didn't know what kind of nursing I wanted to do after I graduated and took the NCLEX! When I graduated, new grads weren't in high demand like they are now, and they definitely were not allowed to start in the critical care, OB, ER, OR areas. I was lucky enough to find a telemetry unit that would hire me, so I started there. I did that for about a year, did urgent care, relocated to a new state and did telem/open heart - and then FINALLY found my true calling in the ER. It took three years from the time I graduated to figure out that I belonged in the ER, and from there I decided to go the FNP route so that I can work in a fast track area of the ER or an urgent care center.
I'm sure some people know right from the start of their nursing programs what they *think* would be the perfect clinical area for them; but until they actually start doing clinicals and experience it first-hand, it can be difficult to make that decision.
Hopefully, when you start clinicals, you'll get a feel for what type of nursing you like. Also, at the beginning of your NP education, all of the different specialties usually share the same "core courses," so you should still have time up until you are almost ready to start your NP clinicals to decide what fits with you. Would your school allow you to switch specialties?