I regret not getting more into Math in college; only got as far as Linear Algebra even though I was pretty good at it, even relative to people in the class. For some reason, I did believe you had to be really exceptional to major in Math. I think it was, in part, because there were a couple really talented kids in high school and everyone including the teachers put them on a huge pedestal. I never felt like I measured up, and if you were smart but not the type to dominate math league, something like Chemistry or Biology were more suitable. Having since met many math majors and even phds, I know know my assumption was kind of false. I look at those talented kids; they're doing advanced degrees or research at top tier universities, and I realize that wasn't the route you had to be on. Oh well.