Jonny has been watching his winning goals over and over again on tape since he fired the Whites to Wembley on Thursday night.
Speaking at his family home in Morley, the modest 19-year-old said:
"My head is still in the clouds. I still can't believe it happened. I have to keep watching it to make sure I'm not dreaming."
Relaxing with a cup of tea, he leafed through the pages of Friday's YEP to relive the moment he secured his beloved Leeds a place in the play-off final.
Jonny, who can see United's Elland Road ground from his bedroom, has been with the club since he was just six years old, when he was spotted while playing for Churwell Lions.
He worked his way through the ranks, playing for the England under 16s squad. But it was only last year that he made his debut for the Leeds first team.
And he said his remarkable progress was all down to the support he had received from his dad Mick, 45, mum Michelle, 43, and brother Daniel, 24.
He said: "They gave up a lot for me, took me all around the country.
"It cost them a lot.
"Their support has been brilliant. They have been a massive help – I couldn't have done it without them.
"The fans have been brilliant too, they are the best supporters in football."
He said he was thrilled to be playing at Wembley – but admitted he would be nervous on the day.
He added: "I'll have a few butterflies and a few nerves, I know. But I'm really looking forward to it. Not many 19-year-olds get to run out at Wembley.
"And to do it for Leeds, who I've supported since being tiny, will be extra special."
Jonny hit two goals in his club's 3-2 aggregate win over Carlisle United in the League One play-off semi-finals.
His efforts mean the Whites will now go for promotion glory at Wembley next Sunday.