The England international, who joined the club from Manchester United on transfer deadline day, insists that he still has faith in his ability in front of goal.
"It is well known I prefer to play through the middle, so when I get my opportunity I just want to show what I can do," The Mirror quotes him as saying.
"Once I get into the box and I'm getting the opportunities, I have got faith in my ability. Before, I wasn't getting into the box because I wasn't playing too much as a striker and I had to worry about my defensive work.
"Listen, anyone can say what they want to say but I just know once I get the opportunity and a run of games up front I will do my best."
Welbeck is expected to make his Arsenal debut this weekend when the Gunners take on champions Manchester City.