Faith is a decision of your heart demonstrated by the actions of your life. Romans 10:9 says, "If you confess with your mouth, ‘Jesus is Lord,' and believe in your heart that God raised Him from the dead, you will be saved." If you trust that Jesus died for your sins and to receive new life through Him, pray a prayer similar to this to express your repentance and faith in Him:
"Dear God, I know I am a sinner. I believe Jesus died to forgive me of my sins. I now accept Your offer of eternal life. Thank You for forgiving me of all my sin. Thank You for my new life. From this day forward, I will choose to follow You."
If you have trusted Jesus for salvation, share your decision with a Christian friend or pastor. If you are not already attending church, find one in which you can worship and grow in your faith. Following Christ's example, ask to be baptized by immersion as a public expression of your faith