In your circumstances, it might be a viable alternative. There are perfectly good programs much less expensive than C4D—and starting with them will both teach you how to build digital models and allow you to start with small but satisfying projects. My caution was not so much about expense (my model stash, sold for value, would allow me to buy any software I wanted, and the best computer system to run it. Selling my tools would allow me to buy anything I wanted in that line. So the outlay is really similar—it just comes in slightly bigger chunks. The main consideration is time. The learning curve is long, and sometimes steep.
Investigate CG websites and ask questions in their forums. While the recent economic downturn has eliminated some of the smaller companies, you should be able to find "starter" programs that will teach you a lot for $300 or less. For example, DAZ Studio is free. It's a figure posing program, but it's a start and will teach you many of the basics.
Programs like C4D and Maya, and other, newer ones are high end, professional level programs (not sure what Pixar and similar outfits are using right now, because I got out of CG several years back, but that's the level of sophistication I mean.)
Look into it—but I advise you not to try to do both unless you have a lot of time and money.