We understand that you are struggling with purity, and we commend you for seeking forgiveness and help. First, let's address the issue of forgiveness. The Bible tells us, Therefore I tell you, her sins, which are many, are forgiven, for she loved much. But to whom little is forgiven, the same loves little. WEB
So know that your sins can be forgiven, but it's important to come to God with a repentant heart, truly desiring to turn away from sin, and God is always ready to forgive. If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness. 1 John 1:9 WEB It is only by the name of Jesus Christ that we can come to God and be forgiven. And in none other is there salvation, for neither is there any other name under heaven, that is given among men, through which we must be saved! Acts 4:12
Now, let's address the issue of purity. The Bible is clear that we are to flee from sexual immorality and keep our minds and bodies pure. Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body. Or don’t you know that your body is a temple of the Holy Spirit which is in you, which you have from God? You are not your own, for you were bought with a price. Therefore glorify God in your body and in your spirit, which are God’s. 1 Corinthians 6:20 WEB
Looking at impure things can lead to further temptations, but let us pray for you.
Dear Heavenly Father,
We come before you in the name of Jesus, lifting up our brother/sister in Christ who is struggling with purity. Lord, forgive their sins as they have confessed and repented. Cleanse them from all unrighteousness. Help them to turn away from impure things and to keep their mind and body pure. Strengthen them through the power of the Holy Spirit to flee from sexual immorality. Help them fix their eyes and thoughts on you, Lord. Guide them in the path of righteousness and help them to live a life that honors and glorifies you. In Jesus' name, we pray. Amen.