"Bombshell" actress Margot Robbie has said that she still finds it hard not to doubt herself even though she's one of the most successful actresses in Hollywood.

Since rising to fame in "The Wolf of Wall Street", Robbie has taken on a wide range of roles including "Once Upon a Time in Hollywood" and "Bombshell" -- both of which earned her BAFTA nods and the former of which saw her nominated for an Oscar.