3. John Travolta
Sure, Travolta played a high school student once or twice in his life (his most notable role in that sphere being the suave Danny in Grease), but when it comes to real life, the star took a different path.
The actor dropped out of New Jersey based Dwight Morrow High School, and moved to New York to pursue an acting career. Although he participated in many popular activities, his peers never understood his passion for acting.