Just adding to the pile–I changed my major junior year of college, still ended up at a top PhD program in that new area (arguably the best in the world for my subfield). And then ended up going to law school anyway (also arguably the best for my legal field), and became a successful lawyer.
My brother was a Math major, started a Masters in Public Health, realized that wasn’t for him, a friend recommended dental school, and now he is a successful dentist.
This is just two anecdotes from one family, but it is repeated many, many times across a variety of successful professionals. The idea you would know enough about your own aptitudes, own interests, and what is available in the world by the time you are starting college such as to be able to pick your whole future educational and career path with any sort of certainty is not realistic. Maybe, a few kids do follow a pretty linear path. But so many others have a lot more to learn and experience before they can really know what makes sense for them.
So in practice, I think this means a couple things at this juncture for a kid who is not sure what they want to do.
First, make sure your college is comfortably affordable, which to me means not too much debt. I think it is really, really helpful to be able to make choices about what comes next after college without large loans that need to be serviced.
Second, choose a college (or sometimes subdivision within a college, like a School of Arts and Sciences or similar) where you are comfortably well-prepared, and that is on an exploratory model where you just start taking classes and then declare a major later.
Fortunately, this is often not at all a tough combination in the US, as many in-state publics, privates with good need aid, a variety of colleges with robust merit aid, and so on are on that sort of model.
Then as another poster said, you just pick a reasonable first term schedule, and go from there.