Christ’s death and resurrection was for every person on this earth: past, present, and future. This does not mean that every person will accept Him, but He died for all. There is no discrimination against anyone. However, as it says in 2 Corinthians 5:15, we must receive this new life and live for Him (“He died for everyone so that those who receive his new life will no longer live for themselves. Instead, they will live for Christ, who died and was raised for them”).
Since you have received His great gift of salvation, you are free to live for Him. He died for you so that you will live for Him instead of yourselves. What does that look like? It means spending time with Him everyday in prayer and study of His Word. It means joining together with other believers in fellowship and worship. It means sharing the gospel with those around you so they will experience new life.
A new life looks different than the old life. If you are a new believer, then you are a new creation with a new life. Your old life cannot look similar to your old life. Instead, it must be transformed.