"I do not have the aura which is around Salman Khan and Shah Rukh Khan. They have stardom in their style, in their DNA and this stardom is seen in their actions. When they enter, it actually feels like that a star has arrived," he said on being asked what was lacking in him as compared to the other two superstars.
The 51-year-old actor was speaking at 'BhaskarUtsav' here organised by popular daily Dainik Bhaskar.
Aamir said that he had become less judgemental over the years and has learnt "there is a lot of grey between 'white' and 'black'".
"Earlier, I was too judgemental. I was very clear about what was wrong and what was right, but I learnt from experience that different situations define right or wrong," he said.
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The actor said that his role in "PK" was the most challenging.
"I was expected to deliver something very different in the role of an alien. It was a challenging task and this was my best. During the shooting, I imagined that I am on some other planet and delivered my best," he said.
Aamir, whose latest film "Dangal" is all set to release on December 23, said the society should stop discrimination with girl children and provide them equal opportunities.
"This discrimination is the root cause of the problems prevailing in the society. My upcoming film Dangal also deals with this issue," he said.
"Dangal" is based on the life of wrestlers Geeta Phogat, Babita Phogat and their father.