Learning how to use a CAD/CAM software is very good for a wide variety of disciplines, not just in computing! Basically most large scale manufacturing companies use some sort of CAD/CAM software (maybe not Mastercam, but once you've learned one it's much easier to learn the rest), they use this software to design their products that will later be mass produced, so this includes cars, toys, chairs, pretty much any good that can be mass produced. Basically, the CAD software is the tool of the Industrial Designer, the person who designs your chars, tables, screens and so forth. Industrial designers are not to be confused with engineers, as engineers design things to be as efficient and stable as possible, while industrial designers design things to be as comfortable and ergonomic as possible. CAD software is, however, used in a wide range of engineering disciplines as well including civil engineering, electrical engineering, mechanical engineering, mechatronics, enviornmental and computational (and many more).
Learning the CAD software, however, is not usually enough to be employable in the engineering disciplines, as you require advanced knowledge of discipline itself. Think of Mastercam as a tool, you can use it do amazing things but only if you use it correctly, just because you have a wrench doesn't mean you can build a car. Despite this, it's still a HUGELY important tool to learn as almost every engineering discipline and industrial design discipline will use CAD or CAM software. If you're interested in mathematics, building cool things and building them efficiently then I'd suggest trying for an Engineering degree, however if you prefer the more artistic style of design and want to design products that are tailored to the consumer (and don't really like mathematics) then I'd suggest going for an industrial design degree or diploma, allowing you to be employed in the industrial design industries.