The Aston Villa midfielder - who swapped allegiances from Ireland to England five years ago - has been called up by boss Gareth Southgate for the first time after Marcus Rashford and Harry Winks withdrew from the upcoming Nations League fixtures in Iceland and Denmark.
Speaking to SunSport, Grealish said: "I don't want to be on the outside looking in again. But I know for that to be the case I've got to make a good impression.
"It's been a long time coming but this is something I've always wanted to do. I thought it was going to happen five years ago when I took the decision to play for England.
"I'm so pleased it's finally happened. My plan has always been to just get in that England squad for the first time, then make sure I do enough to stay in there."
The 24-year-old star - who was second only to Manchester City's Kevin De Bruyne when it came to chances created in the Premier League last season - insisted he has done the "hardest" bit by getting picked, and now it's all down to him.
He added: "The hardest thing is getting your first call-up.
"Once you are in the squad, it's up to you to make sure you either do enough in the training sessions or games."