During my teenage years I got into arts and slowly but surely I continue to pursue different art forms (poetry, music, painting, photography, etc) but it was just recently that I got interested in mathematics. I used to hate it in high school, mostly because it was thought as formulas to memorize and the results were only right or wrong with no room to understand why.
I was reading about mysticism & occultism which turned me on to numerology, and from there found myself mesmerized by pure mathematics. I'm not interested in applied mathematics, I just find it mundane and trivial while pure math is eternal, abstract and creative.
Right now I'm reviewing my high school topics so I can go into more complex ones. Being using a college algebra textbook I found in a public library and reading Basic Mathematics by Serge Lang.
I'm really a beginner still so if anyone can give me some tips or suggestions to grow into this divine pursuit of abstraction I'll appreciate it. Which topics would I need to have a good foundation to build my studies in pure, theoretical math?