The Englishman scored his first goal in eight months to help Leicester claim a 2-1 win over Brentford.
"I have had to be my own biggest critic and look at where I was maybe going wrong," he told BBC Sport.
"It is just having that humbleness to look at myself.
"Thankfully I got a tap-in [against Brentford] and I won't score an easier one."
He added: "The people who doubt me, and who question me, are the people who motivate me.
"After the Brighton game I assessed how I was doing at the time. I realised I was low on confidence so we went back to what made me the player I am.
"It kind of gave me a kick up the bum. Hopefully I can get back to my best."
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