As a senior in high school developing an interest in math, pursuing a math-related field is advisable. First-year math courses are generally broad, covering essential topics like Calculus and Linear Algebra, which will provide a solid foundation. It is beneficial to explore other subjects, such as chemistry and biology, to keep options open for potential program changes. For those highly motivated, studying an introductory analysis book can offer insights into advanced math concepts. Engaging with these resources will help clarify future academic paths in mathematics.