My (and many others’) favorite definition of entrepreneurship was penned in 1987 by Harvard Business School Professor Howard Stevenson: ”Entrepreneurship is the pursuit of opportunity without regard to resources currently controlled.”
Nothing in this definition requires entrepreneurs to be starting their own companies; entrepreneurial individuals can just as easily exist within established
organizations. How one marshalls the resources to purse an opportunity may look a bit different, but the principles are very similar. (Budding intrapreneurs can find some pointers here, here, and here.)
It is true that entrepreneurs get a disproportionate share of the attention. A ton of innovation, perhaps without the same glory, is being generated simultaneously by intrapreneurs (Sony Playstation, LinkedIn’s People You May Know, and Gmail are just a few examples). As a result, smart companies encourage intrapreneurship.
If you want to solve big problems and drive real change in the world, intrapreneurship may very well be the best answer (for example, distribution and thus monetization is often much easier within established companies). So be a true entrepreneur – start pursuing an opportunity today, using whatever resources you can find.