David De Gea celebrates his side's second goal against Everton[GETTY]
De Gea earned glowing reviews after an impressive display for the Red Devils in their 2-1 win over Everton on Sunday.
The Spaniard however endured a difficult start to life at Old Trafford when he joined United from Atletico Madrid for £18million in 2011.
It was during the first six months or so of his United career that De Gea questioned whether he was good enough and he considered leaving.
"Sometimes. It's difficult when you get a lot of criticism like I did," de Gea said.
"But I kept strong and I always tried to remain positive.
Van Gaal hails De Gea [AMBIENT]
Sometimes. It's difficult when you get a lot of criticism like I did
David De Gea
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"Those early days were difficult for me and my family.
"But when you play for a big club like Manchester United (being criticised) is normal when you don't play well."
De Gea admits he was glad he came through that testing period, and believes he is better for it.
"What happened at the start helped me be the player and man I am now," he added.
"When you have bad moments you have to improve. You have to become stronger to deal with it and I believe I have become stronger. I am much better now."