The 22-year-old seemed set to play a pivotal role for the Red Devils' after an impressive start to the campaign but an ankle ligament problem curtailed his involvement and he did not start a Premier League match after October.
"It has been a nightmare at times but I am only 22 and have around 15 years ahead of me yet. I just hope I have got it all over and done with now," he told the Manchester Evening News.
"There were times during the season when I thought I was the unluckiest footballer in the world.
"From a great start it became the hardest season of my life but it has made me mentally stronger.
"I've always had to cope with disappointments in my career. I had two injuries over the years (undergoing shoulder surgery and having a knee problem in loan spells at Leicester and Watford respectively) but I got through them.
"This was the hardest yet. If you had said to me after the Everton game in October that I wouldn't start another Premier League game in the season I would have been massively gutted.
"But that turned out to be the case and it was tough to come to terms with.
"There is nothing more exciting in life than to be playing for Manchester United. To have that taken away is very hard to deal with.
"I don't feel I am owed anything. I've had some bad luck and now I have just got to get on with it."