While describing the ongoing love that many viewers continue to have for the film as "really touching", Curtis admitted that there are parts of the film which are now "bound to feel out of date".
Curtis made these comments when speaking to host Diane Sawyer, who was anchoring a one hour BBC Special called The Laughter & Secrets of Love Actually: 20 Years On.
The director was appearing on the show alongside cast members Dame Emma Thompson, Hugh Grant, Bill Nighy, Thomas Brodie-Sangster and Laura Linney.
"There are things that you would change, but thank God society is changing", Curtis said.
"My film is bound in some moments to feel out of date," he continued. "The lack of diversity makes me feel uncomfortable and a bit stupid".
"There is such extraordinary love that goes on every minute in so many ways [in life generally], all the way around the world, and makes me wish my film was better" he added. "It makes me wish I'd made a documentary just to kind of observe it".
Love Actually earned two Golden Globes following its release.
Bill Nighy also won a Bafta for best actor in a supporting role for this movie, and described that it was "wonderful to be part of".
