The Portuguese scored his first goal for United in Sunday's 3-0 win over Watford.
"This is what I want to do and what I need to do," Fernandes told BT Sport.
"Everyone knows we want to get into the Champions League places. I am here to help the team conquer this place and keep winning games.
"This is the day every player wants to have. I feel lucky to score, I feel lucky to win the game. We all gave our best and we all deserved the win. I just need to help the team, it's what I want to do, it's what I need to do. I hope Martial scores more goals too like he did tonight."