Have an Answer?
Do you have any relatives, friends or acquaintances who have attended college and also have pursued careers? If so, these are wonderful people to seek out and talk with. They have gone through what you are facing and can probably give you good insights.
If you do not know anyone like that, then it is advisable to seek out one or more mentors who do have that kind of life and career experience.
Such a mentor will possibly be able to help you determine HOW to go about thinking through questions like, "What should I major in when I attend college?"
In the meantime, the best thing to do is to nail your high school classes - do as great a job in them as you can possibly do. Build up good grades and get involved with extracurricular activities that can begin to expose you to new experiences.
Most high school students either (1) have no idea what they will major in when in college, or (2) think they do know but are likely to change their minds by the time they are in college awhile. In this light, it is best to focus on what is in front of you, taking maximum advantage of present opportunities and challenges.
The best way to build for the future is to build right now.
All the best to you.