A Game Designer, as job description, is not the same thing as Game Programmer or Engineer. So focus on what it is exactly that you want to do. If you want to be a programmer, listen to these people talking about languages and it's hard and stuff.
If you want to be a Game Designer, it's still hard and stuff, but has little to do with programming. Instead it's about game theory, storytelling, resource management, play mechanics, architecture, lighting, and puzzle and quest building. Game design is like being a movie writer/director, and sometimes cinematographer as well. You are the one who designs the game, the story, the mechanics, the levels and level design. All those really smart programmers write the stuff you need to make your game. There are usually proprietary tools with each studio, 3d tools and scripting tools, so being flexible and skilled at quickly learning new applications is vital (good exercise is to pick up 3DMax or Maya or Photoshop, and learn how to use it cold, no documentation. Most in-house tools are sorely lacking in instructions, so get used to that.) A Game Designer is a swiss army knife of skills, but seldom is one of them programming.
And there's really no school for that.