Dominic Smith will be thinking about this game for a while.

Smith went 1-for-4 with two strikeouts in the Mets’ 7-2 loss to the Padres at Citi Field on Wednesday — and glaringly committed a plethora of ugly plays in left field as his team lost for the fourth time in the past six contests.

“I don’t want to say alter your confidence, but it’s very frustrating,” Smith said when asked how previous errors have affected his play. “We get here so early every day and put in so much work to be prepared for the game and then you get your one or two chances and stuff like that happens.”

The Mets went up 1-0 on Michael Conforto’s RBI single in the first before the Padres evened the score in the second, but the third saw three more San Diego runs, all while exploiting Smith’s shoddy defense.

After Padres first baseman Eric Hosmer hit a sacrifice fly to score Manuel Margot and move Manny Machado to second, Hunter Renfroe ripped one past a diving Amed Rosario to Smith in left. But the ball trailed under Smith’s glove for an error, allowing Machado to score and Renfroe to reach second.

Franmil Reyes, the next batter, then lined one over Smith’s head, scoring Renfroe, and Reyes moved to third on Smith’s bad throw to the cutoff man — Smith’s second error of the inning — to extend the Padres’ lead to 4-1.

The next inning wasn’t any more forgiving for Smith, who allowed Fernando Tatis Jr.’s line drive to hop over his glove and reach the warning track for an easy double.

In the eighth, Padres catcher Austin Hedges’ RBI double brought in Luis Urias, and then another hit from Tatis challenged Smith. He slid for the blooped pop-up near the third-base line, but it bounced out of his glove, allowing Hedges to give the Padres a 6-2 lead.

Smith considers his recent struggles in the outfield to be a learning experience.

“It’s tough [not being able to build off of Tuesday night’s win],” he said. “We played well last night and we had them on the ropes a couple times today. We just weren’t able to put up enough runs.”