As a hobby, I have spent years studying string theory, artificial intelligence, quantum mechanics, general physics, cosmology, astrophysics and other related subjects. I've read numerous books on the subjects mentioned and watched a number of lectures as well. The problem is that, in terms of mathematics, I have about a 3rd grade education, having never successfully passed rudimentary algebraic or geometrical courses. I have tried to read and understand some of the formulae associated with physical phenomena, but to no avail. I really don't understand why the material is not making sense, and was wondering if anyone knows of resources, books, videos, etc., that can help folks like myself understand the underlying math behind these fields of study.