Daniel Fine is the founder and chief executive of Glass-U, a two-year-old, 10-employee maker of foldable sunglasses bearing the licensed brands of universities, music festivals like Lollapalooza, and the World Cup soccer tournament last summer. He arranges for the manufacture of the glasses in China and their distribution around the country. He’s also a senior in college. Mr. Fine financed Glass-U, which operates out of off-campus housing, in part with proceeds from a tutoring company, NexTutors, that he started right after high school. He has also founded Fine Prints, a custom apparel company he started during high school, and Dosed, a health care technology company that is working on a smartphone app to help diabetics. In a recent conversation that has been condensed and edited, Mr. Fine, who is 21 and attends the University of Pennsylvania’s Wharton School, talked about how he got started in entrepreneurship and why he decided not to complete his application for a Thiel Fellowsh