It's a shame that most students don't realize the extraordinary situation they are in. You might be still living with your parents receiving food, shelter, financial and emotional support. This is a time to go out and figure out what you like and don't like so that you can then bring it all together into, not just a random guess at a future but a future career that is fun and fulfilling.
When you take the time to discover what you really enjoy, you end up with a career that feels almost like going to play every day and having someone pay you to actually do something you would probably do for free.
If you love math and are really good at it, here are a few links to lists of careers that might be of interest to people like you who really like math:
- When Will I Use Math (40+ Careers)
- 10 Seriously Cool Careers That Need Math
- Careers with Math (+plus Magazine)
- 7 Dream Jobs That Require Math
- 21 Seriously Cool Careers That Need Math
- 13 More Seriously Cool Jobs That Need Math
While I am not suggesting that you necessarily choose a career right now out of the above lists, take the opportunity to get a summer job working in an industry you think you might enjoy, just to learn more about it and try it out. If you haven't realized it yet, that's the real gift of being at a student age. Having time to discover and choose while you don't have responsibilities such as life dependant bills to pay and a family to take care of. Take advantage of this time while you can.
If you try a job and discover that you really like the industry, great! It will come in handy when you put together your resume for finding a job after you graduate. On the other hand, if you discovers that you don't like it, it's probably better to find out sooner than later so you can focus on what is really important to you. And besides, you never know what one job will lead you to.
Note that you don't have to actually work in the position you are considering. Just being around the people, seeing how the business works, being able to ask questions and maybe even try stuff out can be an amazing experience.