How is my major linked to my profession.

Well, in the racing world, they're merely called engineers. At school, the major is mechanical engineering. The direct connection goes beyond just the name though. Many, many things automotive (at least for the time being) are mechanical. Engines, suspensions, interior components, HVAC, etc... all fall under that 'mechanical' umbrella.

In the next ten years things are going to change drastically though. The need for 'green' vehicles will eventually phase out the internal combustion engine. Racing is already being effected by shift to the need for electrical engineers in engine development. Fortunately, automobiles in racing will always need suspension systems and a chassis.