O'Reilly and Mateo Kovacic struck late for Saturday's 2-0 win at Goodison Park, with the 20-year-old quickly establishing himself as an important component of City's team.
“I mean, my second Premier League goal, it’s an amazing feeling,” he told CityTV.
“And it was an amazing feeling running over to the fans to celebrate. It’s crazy. It feels like my dreams are coming true.
“But it’s only the start. I need to keep going. I mean I’m enjoying it (playing at left-back). It’s a tough challenge adapting to that new position.
“But I’m just learning every day. I’m just glad I’m getting some game time.”