The 37-year-old replaced Claudio Ranieri as the Nerazzurri boss on March 26, 2012.
"It changed my life," he told Inter Channel. "Now we all know each other a bit more. It's the life of a simple young man that changed drastically.
"Sometimes I still can't believe it because it's a dream for me to be experiencing this job on this stage in the first person.
"I'm very happy. I have to thank everyone around me and all the Nerazzurri players and staff."
Inter are currently sixth in Serie A with 47 points from 28 matches.