Matthew Schaefer has ice in his veins.

The 18-year-old hockey phenom is doing everything right in his early days with the New York Islanders , with the first overall draft pick coolly thriving on and off the rink a month into his rookie season on Long Island.

“I visited New York City once a couple of years ago, and then that was really it. I didn’t know much about Long Island,” the young NHL star told The Post after a practice last week.

“Now I feel like I’ve known this island forever,” said the Ontario-born player, who recently shattered the legendary Bobby Orr’s record of being the youngest defenseman with a multipoint game.

Schaefer has quickly become a blue-and-orange fan favorite and gets praise for showing exceptional emotional maturity in the wake of losing his mother, Jennife

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