Worthington admits he is happy with his side’s performance, despite their failure to qualify.
Northern Ireland managed a goalless draw against Czech Republic in Prague on Wednesday.
“It has been a good campaign for us overall and I think we can take a lot of positives away,” he said.
“We did drop our guard against Slovakia and I have said if you don’t treat the game with respect, it can kick you in the teeth, and that is what happened.
“But I asked for a big performance and the players didn’t let me down. I knew if they performed, they would get a result and we certainly deserved it.
“There is no point in looking back and asking, ‘what might have been for this campaign?’.
“I only want to look forward. The players have been super and the staff have been first class throughout also. The supporters, home and away, have been amazing as always.”
