Need help to get better at Math

Hey there /sci/,

This being my first time lurking /sci/, I decided to post the question:

How do I get better at Math?

I'm currently a sophomore in college and declared myself as a Math major.  I'm taking Number Theory as well as Calculus 2 at the moment (I had to take Pre-calc 1st semester Freshmen year, and Calc 1 2nd semester but this was not the same Calculus for math majors, so I had to retake Calc 1 last semester).

While I find Calculus to be a bit more understandable, Number Theory is just getting ridiculous, as it requires me to take several hours, and at times with study groups, to do my homework assignments.

I was wondering if there were any way that I could emerge myself more in the math community so that I can learn to think more like a Mathmatician.

I didn't have the opportunity to take higher level math courses in high school because the high school I attended was a charter school that had just started off for hispanics.  So they didn't offer any advanced courses, or even pre calculus.

I know that I'm a bit behind, but I'm willing to put in a lot of effort to get my career off the ground.  I'm striving to become an Actuary.