Feelings. They can blind us, lead us astray, overwhelm us, color our vision so we cannot see truth. Emotions are inescapable; they are part of us. Do you remember first falling in love? The feeling is so overwhelming you cannot think straight. No matter what the object of your love says or does, they are idolized.
When we are captured by Jesus' love, what He says deserves belief. He is an object of love worthy of worship. He speaks truth to us about who we are. He tells us we are forgiven, even when we don't feel forgiven. The sin in our life, revealed through the truth of the God's word, reminds us we are sinners. We can use that truth to beat ourselves up over and over. Satan whispers it to us to get us to a point where we want to reject Jesus' gifts to us. Sometimes others, including preachers, use it to try to shame us into obedience.
The truth is Jesus has forgiven you. You can trust what Jesus tells you.
And he took a cup, and when he had given thanks he gave it to them, saying, "Drink of it, all of you, for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. Matthew 26, ESV
"Truly, I say to you, all sins will be forgiven the children of man, and whatever blasphemies they utter" Mark 3, ESV
And he said to her, "Your sins are forgiven." Luke 7, ESV
I am writing to you, little children,because your sins are forgiven for his name’s sake. 1 John 2, ESV