The Portugal international, 25, swapped Sporting Lisbon for the Red Devils in January, becoming an instant success before games were suspended in March.
"You know, I will say the truth that I was scared," Fernandes said in an Instagram Live interview with Mario Djurovski. "It was a dream [come true] but it was a big dream.
"For me, playing in England and for Manchester [United] was the highest part of my career. To play in the Premier League, for one of the best teams in the world.
"When I received the call saying: 'Bruno, you have the chance of moving to Manchester' I called my wife, my brother, my sister, my mother and just started crying.
"But I was crying through happiness. I fought all my life for this, for this top club. The chance was here and I needed to take it with both hands, to follow my dream.
"My family knew since the beginning that I wanted to be a footballer, they knew my big dream was to be in the Premier League and to play for Manchester."