George Friend spoke after Boro's defeat to Luton Town at the Riverside.
The defender was Boro's captain, back in the team for the first time since early November - but Friend conceded it was far from the team showing he wanted on his return from injury.
"It was a really poor perfomance and they played the conditions better than us," he said.
"They outfought us in place and that's not good enough. Whether it's teams trying to get promoted or teams fighting to stay up, we have to match them.
"We have more opportunities, and we know how good we can be. We can't be down in the dumps, we've got to move on quickly. Positivity is the main thing."
Watch the full interview with George Friend in the video player above.