Conor Coventry spoke to CharltonTV following the Addicks' 2-1 defeat at home to Blackpool.
The result ended Charlton's 10-game unbeaten run at The Valley in the league.
The 24-year-old said: “It was frustrating. We have to blame ourselves; we gave ourselves too much to do. We need to accept that we weren’t good enough and that's what's frustrating.
“We came out in the second half and showed character and intent, but the damage was done.
“We know that we've got to be better, we weren't good enough as a group. We’ll sit down with the staff, and we'll look at it, seeing what we can do better. All we can do is improve. It’s going to be a long season; we've got make sure that doesn’t happen again.”
The Addicks began the game in a 3-5-2 formation but switched to a 4-3-3 shortly after the visitors scored their second goal.
“I think the formation change helped," Coventry said. "We probably did look better in the second half. I felt that our intensity was off today, something we're usually so good at, that was the main problem.”
