Before entering the course i was skeptical , and until the thirty year i fell like i was wasting time. The point is, when you are at the academic world, it´s not about how get real things done, it´s more about to learn general concepts to build a solid base (in terms of knowledge). With this base, you will be able to learn how to get REAL thinks done much more fast, in a very professional way(read, trustable for the "market").
Therefore, you are not going to CS (or Math, another good option) to get things done, you are going to build a very good "BASE" to get (a lot of) things done.
In a simple way, goes like this: Learning lisp, python, c++ and java, you are investing on "content" for your professional life. Going to CS you are investing in "context". A guy who learns lisp in a garage is very different from a guy who made CS and learn lisp by himself. The second one have much more "base" and a better context to solve problems, although both have the same "content" (the lisp knowledge).
Don´t give up on CS and try to be close from as much people as you can, specially the good guys ... in this way you will be building a very good "context".
Oh, about the programming language ... i think you are starting from the wrong point. First, you should pick up an idea or project to implement (something that you really want to do) and then you go for the language. And yes, the best way to get "content" is working on real projects. Ruby is good for scripting, as python and php are, so if you are going to build something for the web, you should not think about C, C++ and Lisp, just pick a language more close to the web related stuff. But if your idea, or project is about mathematics, desktop and hard calculations, forget about ruby and php and go for C or Lisp. Therefore you start choosing a project (or idea) and then the programming language to learn, not the language and then the idea.
Well, i´m a very noob just like you, and my words are probably full of lies, but that´s my experience in the last five years. Hope you can get something useful from this big (sorry by that) post.
And sorry by my poor english.