I actually don't know how people from Poland regard their own nationality. But, as far as my knowledge and experience is concerned, "Polish" would be their nationality.

definitely ''i'm polish'' iz the best way 2 go:)

it's just to say:i'm polish(adjective).if you want to refer to your nationality. or you say i'm a pole(noun) if you want to refer to your race.

"I'm Polish" is correct. "I'm a Pole" is also correct. "I'm Pole" is incorrect, because "Pole" is a noun, not an adjective.