Expand your mind. Tell someone you love them. Your head is full of ideas put there by others - friends, teachers, family. Just because a thing is true for your friend doesn't mean it's true for you. Turn ideas over to see what's underneath.
Caution is advised.
History is splendidly littered with men and women who've challenged authority and were proven right. Galileo was under house arrest for questioning conventional wisdom. Copernicus had the audacity to suggest that the Earth whirled around the sun instead of vice versa, and the authorities were outraged. Science, religion, medicine, the arts - all have been advanced by men and women who challenged The Wall. Don't take the president's word for it, or your professor's.