Did you ever get tired of being asked that question about what you would be when you grew up? That question comes from a generation who decided on a job and then stayed in that job for most of their adult lives. But, things have changed.
Instead of wondering what you want to do all your life, just think about what job you want to be in for at least 5 years of your adult life. That will help you decide on a college major and will help you answer that question "what will you major in" every time you talk about college.
Choose a major that will help you accomplish what you want to do for the first 5 years, and then make sure it is flexible enough for the years beyond that.
For example: If you choose history as a major, what will you do with that major? Will you teach? Will you write history books? If you want to write history books, what else can you do to earn extra money? That will help you decide on a college minor.
Another example: If you choose religion as a major, add some teaching classes so you can teach at a private school. Then you have the flexibility to earn extra money when it's needed.
If you have no idea, don't be afraid to start with general studies and ask the college career center for some help deciding. Most people change majors, it's not a big deal.
So, next time you are asked what you will major in, just think ahead to 5 years out of college as plan A, then say you plan making sure you studies are flexible enough to give you options.