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My two cents:
If you're excelling in math, move up to a higher level. Math departments are usually very flexible in this regard (engineering departments not always so). My freshman year I signed up for a couple of graduate level math classes, and believe me, the knowledge I gained is not to be found in Wikipedia, or any other written form. You have to struggle for an understanding of higher math, and the setup for the struggle is greatly helped by having fellow students, a professor to guide you, and hard deadlines to motivate you.
I also felt a lot of classes I was forced to take were incredibly lame. I dropped a few classes throughout my undergrad, including two English classes. All I cared about was math as an undergrad, and because of that the education I got was incredibly impoverished. Looking back, I think this was simply a defense mechanism. I knew I was a hot shot at math, so whenever I felt challenged in another subject it was easier to simply say, "This is trivial, I just can't be bothered! I'm clearly intelligent anyway." Don't let the knowledge of your own intelligence prevent you from undertaking things that challenge your supposed intelligence! In particular, writing papers is hard, but is often misidentified by science oriented people as being lame or stupid.
Now, as a graduate student, I fantasize about being an undergrad again and having the luxury of being coerced into studying a variety of different topics. Yes, there are still lame aspects to many classes, but that is largely a factor in lower division work. If you can teach yourself then do so! Leverage your intelligence, learn more, and get yourself into upper division classes in multiple subjects where you can interact with intelligent people who are passionate about the subject, and where the professor will treat you like a valuable resource to be developed rather than simply a chore.