Oxford boss Chris Wilder was unimpressed with his side for the manner of Morecambe's late leveller as they were held 1-1.
Alfie Potter fired the U's in front from Sean Rigg's pass but too often the hosts, lacking confidence after back-to-back defeats, were shot shy. And Jack Redshaw came off the bench to head home a stoppage-time equaliser for the Shrimps for his 16th goal of the season.
"We've killed ourselves by making five mistakes in the space of 45 seconds for their goal," Wilder said.
"There were two not great decisions in midfield. We should have run the clock down, so our game management was poor, then from one long ball conceded a needless corner. And at the corner the goalkeeper gets blocked and our defender who should have been doing a marking job, goes back on to the post.
"So at the end we have a feeling of desperation, annoyance and anger.
"We had a decent second-half performance, to be fair. We changed our shape about, got into the game a bit more and we should have scored more than the one we did, then their late goal would have been a mere consolation goal."
The draw effectively ends Oxford's faint hopes of making the play-offs.
"It's another game where we've not got out of it what we should have got," Wilder added. "A point wasn't enough."
Many Oxford fans have been questioning whether Wilder should remain in the hot seat. But he answered: "Until somebody tells me otherwise, it's head down and I carry on.
"We need robust players at this club. I need players who are going to play 35 and 40 games a season, players who can see the season out, and we've not had that. To score one goal in the last three games is not good enough for anybody."