That is right, and all thanks and glory be to God.So you have not committed willful sin since you became a Christian.
There is no such thing in the NT.How about sins committed in ignorance?
James writes..."But every man is tempted, when he is drawn away of his own lust, and enticed.
15 Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death." (James 1:14-15)
The requirement of temptations, lusts, and enticements, for anything to be a sin, rule out ignorance.