The highly-rated 19-year-old has impressed in the Toffees' first three matches of the season and his form has been recognised by Roy Hodgson who selected him for Friday's World Cup qualifier at home to Moldova.
"When the gaffer (Roberto Martinez) told me I was over the moon," said the teenager.
"It was the best feeling ever. To get called up to your country's senior side, there is nothing better that can happen.
"I think it will be a good experience being around top-class players like Phil Jagielka and Frank Lampard and learning from them all."
Barkley added on evertontv: "I'm humble about it and hopefully I do get a cap - and then plenty more in the future.
"It's been a positive start to the season and I'm hoping to push on and do better as the season goes on."