Just curious, when you say "mathematics", are you more on the side of applied mathematics, things like accounting, statistics, probability, physics, etc. Or are you more interested in the pure/theoretical side of math in algebra, calculus, discrete, logic, number theory, etc. If you have a strong preference for one side as opposed to the other, that can drastically effect what path you want to go down in school.
If you prefer applied mathematics, you're going to want to stay in more business-related fields like accounting, some actuarial services(although a lot of them use theoretical mathematics too), financial services, statistical research, even medical/pharmaceutical-related fields. If you lean towards the pure/theoretical end of the spectrum, that's going to put you more towards a computer science or any of a million different kinds of engineering, computer/chemical/electrical/nuclear, etc.
I think that was my main downfall when initially choosing a major in college. I went all-in for the computer science degree offered through the school of engineering at my University. It required enough math that it got you within about 6 credit hours of a double-major in mathematics, but it was HEAVILY weighted toward the theoretical side of mathematics, which come to find out, I hate. After running through Cal-1-2-3 and then linear algebra and Complex Analysis, I couldn't take it any more, I hated it. I never really sat down to realize what I liked about math in the past, but it's definitely applied/"real" math. I love physics, I love statistics, I love data analysis. I went completely in the wrong direction, not really knowing there was a "wrong" direction to take.
A lot of people think they like math, but not many people love ALL math, you may have a very strong preference for a certain branch over another. Liking "math" is like saying you like "science". Well, what science? Astronomy, chemistry, biology, etc? Depending on where your interests lay, one field may seem incredible, and another may seem like a complete bore. Math is the same way, imho. I don't know too many people that just like ALL facets of math, regardless.