Everyone is a Sinner
This is covered in the study Forgiveness and Salvation; this is a brief summary.
"Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned" (Romans 5:12)
"If we say we have no sin, we deceive ourselves, and the truth is not in us." (1 John 1:8)
"The fool says in his heart, 'There is no God.' They are corrupt, they do abominable deeds, there is none who does good. The LORD looks down from heaven on the children of man, to see if there are any who understand, who seek after God. They have all turned aside; together they have become corrupt; there is none who does good, not even one." (Psalm 14:13)
The basic statement, written many times throughout the Bible, is that every human being is not only tempted to sin, but actually falls to that temptation and commits sin. The only exception to this is Christ Jesus, who, although he was tempted in exactly the same way as us, never committed any sin.
This means that we all have the experience of being tempted; we all know what it feels like.