So, I thin the actor was Jim Carrey. I can’t remember the name of the movie but have watched it over 10 years or so ago, I thing. It basically was when Jim, ac the MC, was living his life without realizing he was actually in a popular TV show. Everybody else was an actor and knew they were actors, except him. He slowly comes to realize his whole life was a lie.
“The Truman Show” (1998)
Quote from the above IMDb page:
“An insurance salesman discovers his whole life is actually a reality TV show.”
Jim Carrey plays in the movie.
I am pretty sure this is the movie you are looking for. If you agree, then please select my answer as Best Answer by clicking on the “Select” button.