Point #1: No one is incapable of learning a subject. Perhaps you had bad teachers before, or the material was presented in a way that just doesn't work for you... some people are far more visual, and being able to visualize math helps them immensely

Point #2: Meet your new best friend: http://www.khanacademy.org Go here, I suggest setting up a (free) account, but first just go through the list of videos. Your first goal is going to be finding where you are competent in math now in the video series. It goes all the way down to 1+1, so you can certainly find a point at which you're comfortable. For example, I'm sure you can do basic addition/substraction, can do multiplication in your head for numbers up to 9x9, and at least know how to operate a calculator to accomplish division and more complex multiplication, right? So find a video that you're like, "Yeah, I got all this" and then move up to the next more difficult one.

See if this method works for you. Many people find this much better than reading out of a textbook.

Good luck!

H.