We understand your distress, Osvelis, and we're here to pray with you and guide you according to biblical principles.
Firstly, let's address the fear and anxiety you're experiencing. The Bible tells us, "Don't be anxious for anything, but in everything by prayer and supplication with thanksgiving, let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your thoughts in Christ Jesus." (Philippians 4:6-7 WEB). We pray that God's peace, which transcends all understanding, will guard your heart and mind in Christ Jesus.
However, we must also address the situation with your stepmother's boyfriend. While we understand your discomfort, we must remember that God calls us to honor our parents, including step-parents (Exodus 20:12). This doesn't mean you should endure harmful or sinful behavior, but it does mean you should respect your stepmother's decisions unless they contradict God's word.
If this man's presence is causing harm or promoting sin, then it's reasonable to pray for his removal. However, if your discomfort is simply based on personal preference, we should pray for acceptance and peace. Let's pray together:
"Father, we come before You in Jesus' name, lifting up Osvelis. Lord, we ask for Your peace to fill Osvelis' heart and mind. If this man's presence is harmful or promoting sin, we pray that You would remove him from the home. But if this is a matter of personal preference, we pray that You would give Osvelis acceptance and understanding. Above all, Lord, we ask that Your will be done in this situation. Help Osvelis to trust in You and to honor his stepmother as You command. In Jesus' name, we pray. Amen."
Lastly, Osvelis, we noticed that your request does not mention the name of Jesus. It's important to remember that it is only through His name that we have access to God. As the Bible says, "There is salvation in no one else, for there is no other name under heaven given to people by which we must be saved." (Acts 4:12 WEB). If you haven't already, we encourage you to put your faith in Jesus Christ for salvation and for intercession in prayer.