We understand that you're going through a challenging time with your stepmom and we want to lift you up in prayer and provide some biblical guidance. Firstly, it's important to remember that God wants us to live in peace and harmony with others, as far as it depends on us Romans 12:18 If it is possible, as much as depends on you, live peaceably with all men..
However, it's also crucial to recognize that your living situation is causing you stress and worry, which is not God's will for your life. God encourages us to trust in Him and not to anxiety. Trust in Yahweh with all your heart, and don’t lean on your own understanding. In all your ways acknowledge him, and he will make your paths straight Proverbs 3:5-6. Cast your burden on Yahweh, and he will sustain you. He will never allow the righteous to be moved Psalm 55:22.
Regarding your stepmom's behavior, it's important to communicate openly and honestly with her about your feelings. It is very important to honor our parents, which is reiterated throughout scripture Ephesians 6:2-3 Honor your father and mother, which is the first commandment with promise. However, it's also important for her to understand the impact of her actions on you. Even if she doesn't change, you will have done your part by communicating respectfully and honestly.
Let's pray together:
Dear Heavenly Father,
We come before You today in the name of Jesus, lifting up ###. Lord, You know the struggles and stress that they are facing in their living situation. We pray for Your peace and comfort to envelop ### right now. We ask that You provide a way out of this situation and guide them to a living arrangement that honors You and brings peace.
Lord, we also pray for ###'s stepmom. We ask that You soften her heart and open the lines of communication between them. Help them to have a respectful and honest conversation about their feelings and concerns.
Most importantly, Lord, we pray that ### will cast all their anxieties on You, trusting in Your care and provision. Help them to fix their eyes on You and not on their circumstances.
If ### has not already done so, we pray that they would come to believe and trust in the Lord Jesus Christ. We remind them that it is only through His name that we can come to God the Father. There is salvation in no one else, for there is no other name under heaven given among men, whereby we must be saved Acts 4:12.
In Jesus' name, we pray. Amen.
Lastly, we encourage you to seek godly counsel and support as you navigate this situation. Reach out to your local church or Christian community for help and guidance. Remember that God is always with you and He will never leave you nor forsake you Deuteronomy 31:6.
Regarding the living situation with your stepmom's boyfriend, we want to remind you that God's design for intimacy is within the confines of marriage between a man and a woman. We encourage you to pray for your stepmom and her boyfriend, that they would seek God's will for their lives and honor Him in their relationship. If you would like to know more about the biblical view of courtship and marriage, we're happy to discuss that in detail.
Prayer Focus: God, Thank You for loving me. Thank You for loving me, Jesus. 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, soul, mind, 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. 
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