Math is really useful for coding, especially with games. Try coding what you can everyday, you'll be better than you were the day before. Doesn't sound like much, but after a few months, a year, etc you'll be much much much more better than you were before.

You'd be amazed what you can accomplish. Don't limit yourself. Words like not and can't just put up brick walls where they could have been avoided.

Take it byte by byte :)

Disregarding that troll, you can accomplish anything you like if you really like it enough. My interest with BYOND started with Batch, which is something you really want to avoid. I messed around a bit in it and made a few small scripts, and showed them to people, who liked them. I realized I liked Programming. Then I started playing SS13, one of my all time favorite games, and wanted to try to make my own. One day I sat down with my laptop and begun to read guides. At first, I was lost, I felt like a complete idiot, but my previous limited experience in Batch helped me, and over the course of a couple years, I consider myself fluent in BYOND. My first game was horrible, but I asked for help and learned from my mistakes. The one I am working on now makes me proud considering it actually looks professional. It really honestly becomes a second language, and you start typing out code without really thinking. I went from total noon to actually risking helping other people with their snippets. I am now learning some other professional langs, because once you learn one programming language, the rest are easy.

tl;dr blah blah, don't give up, ask questions and learn from your mistakes.

You only really use basic algebra and geometry ever, as well as the basic four. Trig is usefull too. I think the biggest thing is understanding probability and fractions, since almost all games have randomness in them.