"I could have done a lot better this season. I've picked up a lot of injuries," Trippier told reporters ahead of England's Euro 2020 qualifier against Czech Republic.
"There is a lot of competition. Me, Trent (Alexander-Arnold), Kyle (Walker), and you've got (Aaron) Wan-Bissaka playing really well for (Crystal) Palace.
"But I'm here now, and I need to impress to try and start for England and do the best I can between now and the end of the season."
Trippier, who was England's first choice wing back at the World Cup in Russia, has struggled to hit the same heights in Tottenham's campaign having had less than a month to rest before the new season got underway last August.
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"There have been games when I've looked back and thought, 'I could have done this or that better,'" Trippier added.
"People say coming back from the World Cup and going straight back into it again is the reason but I don't think it is. You pick up injuries.
"It would have been nice to have an extra week or something but the season came around early, so you've just got to get on with it."
England play the Czech Republic at Wembley Stadium on Friday.
(Reporting by Rohith Nair in Bengaluru; Editing by Christian Radnedge)
