There are a lot of opportunities for you in the navy if you want to be a pilot, and basically it boils down to three areas: jets, helos, and maritime (P-3's). And if you pass the test/physical and are selected for pilot, you will know that when you sign on the dotted line. But once you sign up and if something happens, if you fail out of the flight program or are found not physically qualified (you get a much more in depth physical once you have joined the navy, the "pre" physical doesnt' always catch problems that might NPQ you) you will serve 4 years in a job the navy selects for you, usually surface warfare officer. As fare as being a female in the navy, I have no complaints, I've been in over 4 years and have had great experiences (even in my first tour, when I did not like the job I had).
I would really think about what you want out of your future, because if you are a jet or helo gal you are going to spend a lot of time away from your family, loved ones, boyfriend, etc.. Its not an easy life.
You should also look into the marines. Talk to as many people you can, and find a good recruiter. Don't let them talk you into enlisting unless that is what you want. Go in the recruiters office with a plan and don't settle for less than what you want. Keep in mind that it seems a lot harder now a days to get a navy pilot slot and the wait is long, so start the process early.