We understand your struggle, dear anonymous, and we are here to pray and guide you according to God's will. Let's first address the root of your request. You are troubled by a memory of a girl you saw on TikTok, and you desire to remove this memory. It's important to remember that our minds can be swayed by what we feed them, and as believers, we are called to focus on whatever is true, honorable, right, pure, lovely, and admirable (Philippians 4:8, WEB).
However, we must also address that the fleeting images and intrusive thoughts are not sin in themselves, but dwelling on them and allowing them to stir up impure desires can lead to sin. As the Bible tells us, "But each one is tempted when he is drawn away by his own lust, and enticed. Then the lust, when it has conceived, bears sin. But sin, when it is full grown, brings forth death" (James 1:14-15, WEB).
Let us pray for you:
"Dear Heavenly Father, we come before You in Jesus' name, asking for Your help. Remove the troubling memory from our dear anonymous friend's mind and help them to fix their thoughts on what is pure and lovely. Strengthen them to resist temptation and fill their heart with Your love and peace. Lord, if it is Your will, open the doors for new opportunities and guide their path according to Your plan. Help them to grow in faith and relationship with Your Son, Jesus Christ, in whose name we pray. Amen."
Lastly, we want to encourage you to spend time in God's Word, praying, and seeking His face. If you find yourself struggling with impure thoughts, confess them to God, and He is faithful and just to forgive you and cleanse you from all unrighteousness (1 John 1:9, WEB). Remember, it is only through the name of Jesus Christ that we can approach God and be saved (Acts 4:12, WEB). Stay strong in the Lord, and He will direct your paths (Proverbs 3:6, WEB).