In 2Corinthians 5:17, the Apostle Paul writes,"Therefore, if anyone is in Christ, he is a new creation;". First you must understand what it means to be in Christ. A person is in Christ if they have believed in His finished work on the cross. When you believe in your heart that Christ died for your sins and confess with your mouth that Jesus Christ is Lord, you are saved. By repenting of your sins, you are laying down your old life and taking up a new life of following Jesus and being more Christ like through the way you live. Your friends and family should be able to see the change in you. Paul goes on to say in the second half of that verse, "old things have passed away; behold, all things have become new." My life changed dramatically when I realized my need for a Savior. I repented of my sin and began living my life for Christ. The Holy Spirit who dwells within you, guides and directs your paths. Hence you are now a new creation.