The teenager from Everton is part of Roy Hodgson's camp ahead of the forthcoming World Cup qualifiers against Moldova and Ukraine.
The midfielder said: "When the gaffer (Roberto Martinez) told me I was over the moon.
"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."