Great Britain U20 began their World Championship (Division 2A) campaign with a 6-3 defeat by Japan in Vilnius on Monday.
Austin Mitchell-King, Jordan Buesa and Alex Graham got the goals for GB, put penalties at key moments in the game cost them the chance of victory.
Head coach, Martin Grubb, said: “It is a big disappointment to lose the game, especially as we were punished for our own mistakes by a very good Japan team.
“We showed good character to get back into the game at 3-2 and we had the momentum. We then took a silly penalty and it changed the game.
“They scored on the powerplay again and we then showed our frustrations by taking too many penalties. Five-on-five we were fine, but you cannot win a game when you give up so many soft goals.
“We need to learn and learn fast to give ourselves the best chance possible of bouncing back in a positive manner tomorrow.
“We have the ability to do so and we will review the game and make sure we are ready.”
GB face hosts Lithuania on Tuesday (face-off 5.00pm UK time).