When we were born again, our old sin nature died and was buried with Christ. Baptism is a picture of us being resurrected into newness in  Christ. So when we are born again, we are resurrected in Christ. We are no longer a singular person. We are put in Jesus. So every good thing in Christ has been made available to us. We need to come to the place where we believe we are a new creation in Christ Jesus to truly be able to overcome sin.