I am a high school freshman and I want to aim to go to Princeton University and study astrophysics but if I can't I'm pretty sure I can make it to UT Austin and study astronomy. After I graduate college I want to join the Navy and become a pilot. Can I become a pilot if I study astronomy or astrophysics? I would eventually like to get a PhD from UT Austin for sure. If I joined the Navy would I need to know how to swim? After all that I would like to try and work at NASA and want to become an astronaut. After all that would it be possible later in life to become a dentist? I am completely serious about all this. If you have any information please answer, I would greatly appreciate it.