How to narrow down a field of study when you enjoy and perform well in every subject?

Might it be odd for a student to love and have excellent academic performance in all subjects—I am that student. I am really confused what to study in the university. My grades are similar (high) in all subjects, and I prefer both scientific and non-scientific subjects. It's like I want to get a degree in all fields. How can I decide what I should choose? What can I study? I have tried a lot of tests, even paid ones, but I get similar percentages for all choices.