The left-back held clear-the-air talks with Mourinho last week and has since featured against both Everton and Sunderland.
And the former Southampton defender has now opened up on his chat with Mourinho.
- Manchester United injury blow: Three stars could be out for the season
- Jose Mourinho must do this against Chelsea to avoid unwanted record
Manchester United star Luke Shaw has revealed all on his talk with Jose Mourinho
"The criticism was very hard but I've had it before," Shaw told Sky Sports.
"But this time around I dealt with it better.
“When I first came to United there was a lot of discussion about me and that was hard, it was something that was new to me. I was used to positive feedback and comments in the media but coming to United everything changed, there was negativity.
Luke Shaw's next club: Where could the left-back go next? Mon, April 3, 2017
Express Sport brings you the Premier League clubs tipped to land Manchester United outcast Luke Shaw. Odds provided by Betfair
Play slideshow AFP/Getty Images 1 of 16
Man City – 33/1
"I took that badly and it knocked me down a bit but this time I've come back wanting to fight and I want to prove everyone wrong.
"At the end of my meeting with the manager I said 'I'm going to prove you wrong'.
“I believe and want to do that, not just for myself but for the fans that have been behind me and supported me through this time.
Get Quotes on Home Insurance
"I can see the light at the end of the tunnel and I want to push for the best from me.
Luke Shaw wants to prove Jose Mourinho wrong
"I had a really good chat with him [Mourinho] and I totally agree with him – I will do whatever he wants.
"I've always been a hard worker but maybe, if I look back, maybe I wasn't working as hard as he likes.
"We had a really good talk and he discussed what he wanted from me and even in a week-and-a-half I've seen a massive change in myself, not just on the pitch but off it as well.
"Now it's my time to fight until the end of the season and show the boss what I can bring to help his team."