Villa hasn't scored for Barca in the last six games.
He said: "Whenever you don't score you get a little worried, but what I have to do is work hard in training and in games and be calm.
"You have hardly any time to decide what to do (in front of goal), and sometimes you decide well, and other times you make a bad choice and don't score.
"A goal will arrive and if I don't score a team-mate will."
Despite Villa's barren spell, Barca have barely broken stride, winning seven and drawing the other of their last eight games to continue their bid for a second treble in three seasons.
It is looking especially good in La Liga, but Villa said: "To have an eight-point lead with eight games left is a considerable difference, but we must not fall into the error of thinking we are champions. Right now only we can lose the league."