Don't make a definite decision until you have to. Most universities don't make you have to decide on a major until sophomore or junior year. Use your first year as an opportunity to take classes in different areas that seem interesting. After you've done that, you'll have a much better idea deciding what to major in.
This is true in the US, but not in the UK - pretty much everyone in the UK has to pick their major over a year before they start university. I'm not sure if the situation is the same on the continent.
If you can pick and choose, I think the best advice is: Statistics! There's nothing I regret not learning more.
I'm a high school senior from Europe and in a few months I'll be heading to university.
I have a keen interest in the human body. As such, I would like to work in emerging interdisciplinary fields, such as stem cell transplantation and suspended animation.
I could go on to study, say, Biomedical Science, but I'm also fascinated with Engineering. That is, I think that my aspirations, which are to improve human condition, could be well served from an Engineering standpoint.
What do you think? Would my interest in the human body and its applications be better suited for Engineering or for Biomedical Science? How should I decide what to study?