Need Advice--Prospective Math Major

<p>Hi, I am a currently a high school senior. I am going to Harvard next year and am planning on concentrating in applied math. I am currently taking college level math through a program at my school. By the end of high school I will have completed all the way up to Calc III. I'm not exactly sure what I want to do with math but I know it's what I want to study. Math has always been pretty natural for me. Any thoughts/advice about what college will be like (especially at a place like Harvard)? Am I prepared? What to expect? What can I do with an applied math degree?</p>