England's 10-match unbeaten run came to an end in north London thanks to an Alexis Sanchez double as Chile outclassed the home side on a sobering evening for Roy Hodgson's squad.
An even bigger test awaits on Tuesday when Germany visit Wembley.
Ranked second in the world and with a squad packed full of stars, the Germans will no doubt look back at a tape of England's performance against Chile with glee.
But Townsend is hoping England can bounce back against their old foes next week.
"The Chile game was a good test for us, and hopefully we can do better in the Germany game." the Spurs winger said.
"The manager came in after the game and said to us: 'we did not get too carried away when we qualified for Brazil, so don't beat yourselves up tonight because there is another game again on Tuesday when we can put all the wrongs right against Germany'."
Townsend earned his third cap as a second-half substitute after manager Hodgson opted for an experimental XI that included debutants Adam Lallana, Jay Rodriguez and Fraser Forster.
Although Lallana impressed, and striker Wayne Rooney worked tirelessly, there were few who came out of the match with much credit.
Townsend did not want to dwell on the defeat too much, however, and defended Hodgson's decision to experiment.
"Friendlies are about giving people the chance to show what they can do, and we did that with rotating the team, but unfortunately did not get the result we were looking for," the 22-year-old said.
"Chile are a very technical side and with the way they kept the ball, for half an hour or so we could not get anywhere near them but if we are going to go to the World Cup and do well, we are going to have to learn to play against teams like Chile.
"We have played a lot of European sides and to test ourselves against a South American side who do play a different style, we will take the positives out of it and move on to hopefully get a good result on Tuesday."