Smalling will line up for England's youngsters today when Stuart Pearce's men open their European Under-21 campaign against Spain in Herning.
"It is crazy what has happened to me over the last year or so, but once you have had a taste of success you just want it again and again. Hopefully this is what will happen for the rest of my career.
"When I got the chance to become a Manchester United player I knew that it was a massive club and that because they are so used to winning trophies I would have to bide my time and be patient.
"To play a big part in the team's success has been so exciting for me. I expected a few games, but the magnitude of some of them has been amazing. I already feel that I am a much better player than I was last year because Sir Alex Ferguson has shown confidence in me and I now feel comfortable whoever I come up against."