While there's not any calculus on the MCAT, your score may benefit from taking the calculus based physics classes instead of the algebra ones. It saved me a lot of time and made some of the questions much easier by knowing Calculus. I'm sure it improved my physical science score by at least a point if not 2.
You also need to figure out if your actually bad at math or just don't like it. When I was in high school, I used the "I suck at math" excuse extensively to stay in easier math classes and just take the bare minimum to graduate. Once I got into college, I found that I was not, in fact, incapable of doing math, I just had to actually put in some effort and study it. Once I did I found that I actually enjoyed it.
If your truly unable to learn and understand mathematics, and I doubt that, then it could be a huge obstacle for you to over come. At a minimum, your going to have to take College algebra and trigonometry. For the MCAT you will need, college physics I and II with labs, general chemistry I and II with labs, organic chemistry I and II with lab. All of these classes require college algebra and trig to understand and do well in.