Current NP Student - How do I choose the right specialty?

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I am currently in an accelerated BNS/MSN NP program and am thinking about what specialties I am interested in and what goals I have long term. I haven't had my maternity/pedi rotation yet, but I am really interested in labor and delivery, neonatal/NICU and maybe even fertility. On the other hand, I also have a love for neuroscience (what my original BS is in), the brain and Alzheimer's - though I'm not sure if care in this area is something I would enjoy long term.

I worked as an LNA at an assisted living home for people with dementia over this past summer and I loved it, however it was so emotionally and mentally draining that it really took a toll on me as time went on. I know nursing and caring for others is never an easy job, and I am a very hard worker, however I want to have a job that won't constantly burn me out. I'd like to have a job that I smile at and am busy at, but am not so mentally exhausted that I can't socialize or do anything but sleep when I get home from a shift. I think that might be why labor and delivery seems so appealing to me... it's usually happy. It also could be the fact that I love kids and I love babies.

Long story short- I know I have plenty of time to figure this out for myself, but I'm a planner and coming up on declaring my specialty for NP it's stressing me out that I have so many interests and can't reel it all in. If there are any nurses/NPs out there I'd love to hear about specialties you're in or jobs you have that you love and why! How did you get to where you are and how did you decide what you wanted to do?