Hart concedes himself and City have struggled to maintain last season's standards.
He said: "My season has not been brilliant. It's had its good times but it's football. It's what I love doing.
"I've enjoyed it, it's been tough, things haven't always gone my way. I'm enjoying the fight and getting back in there.
"Sometimes you take knocks, that's football, you take opinions, but you've got to be strong.
"I feel strong, good, that I'm doing the right things and hopefully I can have a good end to the season.
"I understand you have your great nights and sometimes things don't go the way you want. That's the way it is.
"I'm my strongest critic but I would never bury myself. It's pretty obvious when you make a mistake as a keeper, you don't need to dwell on it too long. It's out there."