Travis Kelce is owning up to his role in a collision that forced Xavier Worthy out of the Chiefs' Week 1 loss to the Chargers ... saying he simply has to be better.

The superstar tight end shared his regret over the freak accident during the latest "New Heights" episode with his brother, Jason , on Wednesday ... and he chalked it all up to not being prepared out the gate.

"I wasn’t ready that first drive, I ran into one of my guys and offed him out of the game, I literally took one of my players out," Travis said. "That's one of the most frustrating parts, and it's hard to get your juices back going knowing you just hurt a guy."

When Jason asked him to go more in depth on the actual play ... Travis said it's on him, and as one of the most seasoned vets on the team -- he should d

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