Psalm 51:
"Have mercy on me, O God, According to your unfailing Love; according to Your great compassion blot out my transgressions. Wash away all my iniquity and cleanse me from my sin. For I know my transgressions, and my sin is always before me. Against You, You only have I sinned and done what is evil in Your sight, so that you are proved right when You speak and justified when you judge. Surely I was sinful at birth, sinful from the time my mother conceived me. Surely You desire truth in the inner parts; You teach me wisdom in my inmost place. Cleanse me with hyssop, and I will be clean; wash me and I will be whiter than snow. Let me hear joy and gladness; let the bones you have crushed rejoice. Hide your face from my sins and blot out all my iniquity. Create in Me a pure heart, O God, and renew a steadfast spirit within me. Do not cast me from Your Presence or take Your Holy Spirit from me. Restore to me the joy of Your salvation and grant me a willing spirit to sustain me. Then I will teach transgressors Your ways, and sinners will turn back to You. Save me from bloodguilt, O God, the God who saves me, and my tongue will sing of Your Righteousness. O Lord, open my lips, and my mouth will declare Your praise. You do not delight in sacrifice, or I would bring it; You do not take pleasure in burnt offerings. The sacrifices of God are a broken spirit; a broken and contrite heart O God, You will not despise. In Your Good Pleasure make Zion prosper; build up the walls of Jerusalem. Then there will be righteous sacrifices, whole burnt offerings to delight You; then bulls will be offered on Your alter."
Even David, the King of Israel, and a 'man after God's own heart' according to scripture wrestled with lust, then committed adultery and then had someone murdered to cover for it (2 Samuel 11-12) and God forgave him.
Also, in Isaiah's prophecy about Christ we read: "Surely He took up our infirmities and carried our sorrows, yet we considered Him stricken by God, smitten by Him and afflicted. But He was pierced for our transgressions, He was crushed for our iniquities; the punishment that brought us peace was upon Him, and by His wounds we are healed. We all, like sheep, have gone astray, each of us has turned to his own way, and the Lord has laid on Him the iniquity of us all." Isaiah 53:4-6
You are not the only one.
There is Hope.
His name is Jesus.