Giroud needed seven games to break his Arsenal duck but says he was always confident he would be able to adapt to the Premier League.
"As a striker you can't doubt yourself - in a career you will have periods of scarcity," he said. "You must be positive constantly and I'm like that. Here, it's a requirement at a very high level.
"When you have an opportunity you must take it. When it's not easy, you have to look ahead and demand more from yourself. That's just my motto."