Onomah is on-loan at Villa from Tottenham this season.
Onomah, who helped England to Under-20 World Cup glory in the summer, signed a long-term contract extension with Tottenham before joining Villa.
And the attacking midfielder has scored three goals in 16 Championship appearances.
He said: “It's been like a dream, really. From winning the World Cup, it had never been done before with the under-20s, to scoring for the under-21s as well, it was a massive moment for me.
“I just have to keep on going. I just have to carry on in this positive mood.
“The people around me will keep me grounded. The experienced players here, they keep me level headed and remind me I have not reached where I want to reach yet."