`Insecure` Robert Pattinson

London: Actor Robert Pattinson insists he always stays grounded because he isn`t very confident.

The ‘Twilight Saga: Breaking Dawn - Part 2’ actor says it`s very easy for him to stay grounded despite all his success because he doesn`t have enough confidence to get arrogant.

"I`m quite an insecure person, so it`s not hard for me to stay grounded. You have to be pretty dumb to let your head get big, especially when everything about your life is reported. Everyone knows you`re just a vain moron," femalefirst.co.uk quoted the 26-year-old as saying.