The Belgian international, 31, ended his six-year spell at Old Trafford to join Shandong Luneng Taishan in January.
The veteran, who scored 12 times in 119 Premier League games for United, also believes too many footballers – including a number of his old team-mates – focus too much on their social media antics.
He said: “You see some players go straight into the dressing room after games and go straight onto social media, it's wrong."
Fellaini is now fully-embracing his latest adventure in the Far East but is adamant he enjoyed his time at United.
He added: “China is good, it's a new culture, a new country and I discovered that. I've enjoyed it."