Study math... Wat do then?

So, i need to apply for college next year. I would really prefer maths (other possibilities would be computer science, physics or engineering), but then i was like 'umm how do mathematicians earn monies?' And how much?
Please, enlighten me.

In my experience, a pure mathematician teaches or publishes books (or the same book as last year but with new pages or diagrams).

You'll probably want to look into what "applied mathematics" means.

What >>2 said.

Oh yeah, you should apply as a math, physics, or stats major, even if you think (or know) you'll switch out. It'll be a hell lot easier to get in than as compsci or engineering, and the entry-level classes are more or less the same anyway.