Washington, June 22 : Shia LaBeouf says that he does not "really know" what his job as an actor means and is unaware how to respond to compliments for his performance.

"I don''t even really know what it is I do for a living - the level of insecurity is very, very high. You''re making a lot of money, getting a lot of accolades and positive criticism for something where you don''t even know what you''re doing," Contactmusic quoted him as saying.

"There''s no business-model for this. You can''t go home and say, ''You did your job today,'' because I don''t know what my job is! That gets crazy, trying to figure that s**t out," he added.

The `Transformers' star rose to fame early in his life, starring in several Disney Channel TV shows.

However, he is skeptical about his job as an actor.

"Actors are dependent on being validated by other people''s opinions. I don''t understand what it is I do that people want. I don''t know what an actor does. I have no credentials. I don''t know what I''m doing," he said.

"To my mind, talent doesn''t really exist. Talent is like a card player''s luck. It is motivation, ambition, and luck. I think acting is a con game," he added. (ANI)