Bellingham proved the matchwinner against Champions League opponents Union Berlin.
He said, "Playing in the Champions League is the best, I thought the LaLiga was good until I heard the noise after the goal.
"The support of the fans is crazy. You don't know how big this club is until you're part of it."
Likewise, he analyzed how the game went: "We were patient. We knew we would have chances. In the end we got it. It was not my most beautiful goal. I want to be in the area to be a good killer and help the team.
"Normally I am a shy boy, but I have adapted very well. I always go with a smile."