Stormzy says playing a rapper in his first lead role made it hard to separate himself for the part.
Big Mike stars as Tenzman in Big Man - the first release from the grime star's production company #MerkyFilm and his first lead role.
Speaking at the film's premiere, he tells BBC Newsbeat: "It was really tough if I'm honest.
"It felt like I'm playing a rapper but I am a rapper, it's tough to totally separate."
#MerkyFilm follows Stormzy's other projects like #MerkyBooks and #MerkyFC which have aimed to elevate black British voices and talent.
