It was Roy of the Rovers stuff from the Southampton striker, a veteran of the lower leagues, as he converted Leighton Baines' corner for the decisive strike in a 3-2 defeat of Scotland at Wembley.
Lambert said: "It was my first touch. It's probably the best header I've headed in my life.
"I saved it for the right time. It was a terrific ball by Bainsey, I managed to lose my marker and he put it exactly where I wanted it.
"If that's the only moment I'm going to have in an England shirt - hopefully not - I couldn't have wished for it to have been any better.
"I've dreamt for it to go like that for a long time and for it to have gone like that was a dream come true.
"I've tried to enjoy it, but my focus was to try and do well. I'm thankful for it to have gone like that."
Scoring the winner in the first England-Scotland fixture for 14 years capped a stellar rise for Lambert and gave him double cause for celebration after the recent birth of a baby daughter.
He said: "The atmosphere was superb. For that to be my first (England game) is unbelievable.
"The way they came back twice, full credit to them."
Lambert returns to club duty with Saints against West Brom on the opening weekend of the Barclays Premier League season.
"That's my main focus now, to do well for Southampton," the 31-year-old added.
"That's my first one. I'm going to try to make it more in the future. Definitely."