Podolski told The Mirror: "I play and in the last games, I always come out and of course you cannot be happy when you always go out after 60, 70 minutes.
"When you go out and you are happy, you are not a footballer so of course I am not happy always to be substituted. It's the decision of the boss, he is the manager. He decides who comes in, who comes out, who are the first XI.
"It's not always easy when you play for a big club but of course I am not happy to always come out and watch from outside. You cannot be happy with this situation."
The 28-year-old has scored eight goals in 21 appearances in all competitions for Arsenal this season.