WHEN HAMPTON FLUKER was growing up in Atlanta, he dreamed of football stardom and a career in medicine. And then one day he happened to watch Glory, a film about the valor of an African-American infantry unit during the Civil War, featuring Denzel Washington. Fluker was impressed by Washington’s performance, but the 15-year-old also responded in a way that suggested the deep reservoir of self-confidence he would later draw on. “This is not hard,’’ he told his mother. “I can do this.’’
Since then, Fluker has learned how wrong he was about the first part of that youthful assertion — and how right he was about the second. At age 22, as he prepares to graduate in May from Boston University’s rigorous School of Theatre, Fluker has already left a distinctive mark on Boston with performances of uncanny technique and power.