How do you decide what major to go into?

I once heard the saying "do what you love and you will love what you do", and that saying has stuck with me in life. Without having any sort of experience in the workforce, you can try to think about what some of your passions are and some things that you care about. If you find something to work on that you're passionate about, it is that much more exciting. If you are really into music, maybe a music/prpduction career would work for you. If you like sports, then sports broadcasting might be the fit for you. If you love to be a leader and teach others, maybe you would be a great teacher someday. I know it's hard to sometimes figure out what you want to do at such an early age but I would suggest starting with something you care about and something you could see yourself wanting to do more of. You can ALWAYS change your mind, I did in college. I started out with one major and switched the next year after figuring out more of what I wanted to do in life.

Undergraduate school is designed to help you with this by requiring general studies. A lot of students that are pretty sure about what they want to do career-wise tend to grumble about this, but in my experience, I have seen students switch majors based on getting new experiences within the general studies area. Even though you declare a major, you can certainly switch interests and change majors. Whatever degree that you have will, it will still help you in the future, even if you change careers.

If you already have skills going into college.., for instance you can play an instrument well, then use those skills to help you possibly get a scholarship and at the same time dig into the various general studies to see what you love the most. A career where you are happy is much easier when it's time to go to work.
I started out as a geology major and switched back to my true love - music, and later added television and video production. I have been happily employed for quite a while.

best of luck!
Kevin