Dont worry, all good programmers I know have sucked at maths at one point or the other. Try sage http://www.sagemath.org/ , its a free software written in python. The software has a web interface which lets you program the equations and see visual output in form of graphs or other suitable figures.

Have a look at sage demo at http://wiki.sagemath.org/interact and try it after downloading. If you still have issues, write back, we would love to help you...