John Cena says his recent hair transplant has "completely" altered his life ... and he's ticked he didn't get the procedure done sooner.
The WWE Superstar -- who revealed back in April he had the scalp surgery after fans taunted him over his thinning hair -- went in-depth on the matter with PEOPLE this week ... and it ain't hard to tell he's loving his new look.
Launch Gallery Launch Gallery Getty"It completely changed the course of my life," he said.