What must I do to be a happy Christian who is not ashamed of the people of God?

All people are a little shy in the beginning when they have to stand up before others to preach or testify or pray. Remember what the Lord said in Mark 8:38, that if a person is ashamed of Him and His teaching, he will be ashamed of him when he comes in the glory of his Father.

Paul said: I am not ashamed of the gospel of Christ (Romans 1:16). That is why we all must confess with our mouths that we belong to the Lord (Romans 10:9-10). If you give yourself totally to the Lord in full confidence that your sins are forgiven, the Holy Spirit will come and dwell in you (Romans 8:10). He will give you courage to witness about what the Lord has done for you (Acts 1:8; Acts 4:29, 31). Pray for the boldness to witness without fear, as the first apostles did (Acts 4:24-31). God loves to hear this prayer.