The Real Madrid striker has not scored for his country since September 2011 and has also come under fire for a lack of effort at club level this campaign.
"I am a forward and for me to do defensive work in principle is important, but an attacker cannot work and run like the right-back," the 25-year-old told reporters at a press conference.
"I'm not going to run to Hugo Lloris's goal. I must make the first pressure on the opponent, and that helps the whole team. I run 10km per game, I move much, so I consider this criticism to be unfair.
"In any case, there is no attitude problem. When I go on to the field, it is to play football. I am living a moment that is a little more difficult than in previous years. This is part of a player's career."
Benzema has scored 15 times in 60 matches for France.