The 36-year-old actor felt he wasn't being very "creative" on the set of the sci-fi blockbuster - which is directed by JJ Abrams and worried he wasn't "finding enough" depth to his character, Poe Dameron, reported Female First.
"I actually felt the most green and insecure than I had in a long time. I was like, 'What am I doing here?' There was a lot of room to shade in the character. Every time I tried to do that, it would slow things down too much.
