You make it sound as if college is the end all be all of mental development. What a terribly restrictive mindset you have.
College is about giving some institution a load of money, passing a bunch of tests, and getting a pretty piece of paper for your resume.
Learning is a lifelong process of conquering your ignorance.
If you don't believe me, just ask:
Mark Zuckerberg, Steve Jobs, Oprah, Bill Gates, Abraham Lincoln, Leonardo Da Vinci, Socrates, Plato, Aristotle... etc... etc... etc...
Self Evolution is limited only by the limitations you put on it.
You should learn the difference, sooner rather than later.