Dr. Ray’s Answer
I don't think I can advise you about your becoming an alien, except to make sure you are a legal one. The singer Sting actually wrote a song in the 90's about being an "alien in New York," so other people, including many adults, have had similar feelings! It can be a blessing, but also a curse, to have a lot of options, since it is harder to narrow them down.
One thing I would say is that you really don't have to be in a big hurry to decide. If you attend college the first two years are mostly basic required classes, which gives you plenty of time to look around and see what interests you. I also think that most people can be happy in more than one career; I don't think there is just one you have to find or be miserable the rest of your life.
If you are serious about becoming an astronaut www.nasa.gov has lots of information for students. It's clear that they want people with a science/technology background, so that could help you narrow down possible majors. (It just occurred to me that if you become an astronaut you might meet some aliens!) I also happen to know that many large police departments require at least some college, and some require a bachelor's degree from applicants for officer positions, so attending college would also help you there. I would bet that the University of Minnesota has lots of information on majors and careers that can help you focus your search. You can tell that I think you should give college strong consideration and worry about what exactly to do with your life later on.
I won't tell you not to worry, since that would be patronizing you. I will tell you that almost everyone eventually finds a career they enjoy, and I have confidence that you will as well. Good luck in your search.
Ray Finn, Ph.D.