John 3:16-21
16 "This is how much God loved the world: He gave his Son, his one and only Son. And this is why: so that no one need be destroyed; by believing in him, anyone can have a whole and lasting life. 17 God didn't go to all the trouble of sending his Son merely to point an accusing finger, telling the world how bad it was. He came to help, to put the world right again. 18 Anyone who trusts in him is acquitted; anyone who refuses to trust him has long since been under the death sentence without knowing it. And why? Because of that person's failure to believe in the one-of-a-kind Son of God when introduced to him.

19 "This is the crisis we're in: God-light streamed into the world, but men and women everywhere ran for the darkness. They went for the darkness because they were not really interested in pleasing God. 20 Everyone who makes a practice of doing evil, addicted to denial and illusion, hates God-light and won't come near it, fearing a painful exposure. 21 But anyone working and living in truth and reality welcomes God-light so the work can be seen for the God-work it is."

We have all heard the saying that it doesn’t matter what a man or woman has done, Christ can and will save them if they accept Him. Now that’s true and the scriptures above enforce that.

And most people are aware that the Apostle Paul suffered with something that he thought was causing him to sin, so he repeatedly prayed to have it removed, but Jesus told him:
2 Cor 12:9-10
9 But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me.

And in the Bible it says that His forgiveness was once and for all:

Heb 7:26-27
27 Unlike the other high priests, he does not need to offer sacrifices day after day, first for his own sins, and then for the sins of the people. He sacrificed for their sins once for all when he offered himself.

So, when we come to Christ we can accept Him and be forgiven, but there is absolutely no way that we can or need to remember EVERYTHING that we have done in the past, otherwise we don’t believe that His sacrifice was sufficient and we want him to do it every time we sin, and that’s not possible; but faith in what has been done for us is.