We understand that you're dealing with past experiences that are affecting your present life, and we're here to pray and provide biblical guidance for you. Firstly, we commend you for coming in the name of Lord Jesus as it is written, For there is one God, and one mediator between God and men, the man Christ Jesus. The only name by which we can be saved is Jesus.
In addressing your past experiences, we remember that the Bible tells us that there is therefore now no condemnation to those who are in Christ Jesus, who don't walk according to the flesh, but according to the Spirit. God has forgiven us of our sins and desires for us to live free from the guilt and shame of our past mistakes. We are grateful that you have been convicted to confess the lie from your childhood and this is a good thing. Take to heart these words. If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness.
Regarding the theft of Yugioh cards, God wants us to understand that stealing is wrong. We are reminded in the eighth of the ten commandments not to steal. Not only does it harm others, but it also harms our relationship with God. We repent on your behalf and we ask God to help you return or repay for the stolen items in some way as Zacchaeus did when he repented and returned what he stole fourfold.
Concerning your speech, the Bible tells us, Let no corrupt speech proceed out of your mouth, but such as is good for building up as the need may be, that it may give grace to those who hear. We encourage you to be mindful of your words, ensuring they are edifying and gracious. We pray that God will help you to use your speech to uplift others and glorify Him.
You've mentioned that you were at different churches and other people's houses. We pray that God will help you find a solid Bible-believing church where you can fellowship with believers and grow in your faith. We encourage you to seek a church that teaches the Word of God faithfully and where you can be held accountable in your Christian walk.
Let's pray together:
Dear Heavenly Father, we come before You in the name of Jesus Christ, lifting up our brother/sister who is struggling with past experiences. Lord, we ask You to heal them from the memories and effects of these past actions and encounters. We repent of the sins committed, and we ask for forgiveness of sins. We ask You to remove any ill effects these actions may have had on their life. We pray that the Holy Spirit guides and corrects their speech, making it pleasing to You and edifying to others.
We rebuke the enemy of your soul for any guilt, shame, or condemnation that he is trying to bring on you. We ask God to remind you of your salvation and the gift of righteousness. We pray for your peace as your past is covered by the blood of Jesus.
Lord, we also ask that You guide them to a Bible-believing church where they can grow in their faith and have fellowship with other believers. We ask this all in Jesus' name, Amen.
We encourage you to seek Christian support and counseling if you feel overwhelmed by your past experiences or they are impacting negatively on your life. We encourage you to not stop coming to God in the name of Jesus.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
