Irrfan says he was often scolded by teachers for not being properly audible in the class.
"My classmates didn't even know I existed in school. I was invisible. When my teacher used to ask my name, I used to stand up and say but they couldn't hear. I was often scolded 'speak loudly, say your name.' I was so shy," Irrfan told reporters.
The actor was speaking at the trailer launch of his upcoming "Hindi Medium", scheduled to release on May 12.
Directed by Saket Chaudhary, the film also features Pakistani actress Saba Qamar opposite Irrfan. The two are essaying the role of parents who want the best education for their daughter.