I am 15 years old and am very interested in electronics and gadgets I'd like to someday get a job in a field where I design new gadgets and gizmos for the modern world. What career should I pursue?

That sounds like you should pursue a field in some kind of engineering field. There is materials engineering and there is also mechanical or electrical engineering in which you use very basic structures and concepts to build new and improved "gadgets and gizmos."