I just want to emphasize a couple of the points made by other posters here.
1) Math majors are doable, but are usually a very bad idea for people who don't enjoy the material or who can't think in very abstract terms. There are fewer classes required for a math major than for other majors like biology that require a sampling of other science courses before even letting students dive into the specifics. Common required classes are calc 1&2, linear algebra, multivariate, differential equations, advanced linear algebra, and electives such as number theory, dynamical systems, fourier analysis, mathematical statistics (not the same as regular statistics, fyi), etc.
2) Don't decide if you want to be a math major until you get to college. It sounds like you've done very well with math so far, but calculus and other courses like dynamical systems, fourier analysis, and even multivariate are very very different. When you make your way farther down the math chain, it will be very common to rely very heavily on proofs (and I'm not talking about the proofs you learned in geometry). I TAed for a proof class, and watched about 25% of the declared math majors at my school decide right then that math wasn't for them after all. It's better not to make your decisions quite yet.
3) Most math classes are short 1-2 hour classes 2-3 times per week. There are no labs, but there will probably be mandatory workshops or recitations that will take up a couple of hours of your time each week, so be prepared for that.
4) If you have AP credit, don't retake calc in college. You can use that credit to place into a higher level math series in college. That's what I did, and the series condensed 6 semesters of math into 4 semesters and taught proof-writing skills from day one. It was a beautiful, beautiful thing.
5) The community college credits are a little bit trickier. Since they aren't med school pre-reqs, not re-taking wouldn't hurt your med school chances. Unfortunately, there is a very solid chance that your undergraduate college won't accept the transfer credits, so if you want math as your major, you should be prepared to re-take.