Just acknowledge the truth and hold fast to the confession of it.
Forget about trying to believe something or talking yourself into something. Just see these facts and know they are true for you and everyone else. They are true regardless of what you believe. They are true for the unbeliever and believer alike.
Jesus died for our sins, according to the scripture.
This is true regardless of what you or anyone else thinks or believes. It is true for you right now. Don't try to work up some 'faith.' You do not have to. He said it, so it is true. Let the strength of the veracity rest with Him. Just say what He said, "Jesus died for my sins." You are doing nothing but acknowledging what He said, and it is the strength of His integrity that affects your life. No struggle. No grimacing to try to work up some faith. Just acknowledge that He said it, He does not lie, and He knows what He is talking about.
These are all true:
John 1:29 KJV
29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
He did this. Your sins are gone, regardless of what you think or believe. Period.
2 Corinthians 5:18-19 KJV
19 To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
God has reconciled the world unto Himself. He did this. It does not matter what you believe or think. You have been reconciled to God. Period.
Your sins are NOT being imputed (counted) against you. It is over. Does not matter what you believe or think. They are gone. Period.
1 John 2:1-2 KJV
1 My little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous:
2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.
Your sins have been paid for. It is done. Not just for believers but for the world. Don't try to piece together some belief or faith. Just know it is true. It is done. Your sins have been paid for regardless of what you believe or say. They always have been. Period.
Stop struggling saint. Stop trying to talk yourself into some mental and spiritual construct. Just know these things are true. They are true right now, always have been, and always will be. Fall on them. Let them catch you and carry you. Rest in them like a soft bed. Let them do the work.
"Well, He said He died for our sins, took them away, paid for them in full, and is not counting them against me... It must be true. He does not lie and knows what He is talking about. I will just rest in these facts and simply KNOW THEY ARE TRUE."