Will I need to change my Sinful Lifestyle? 

The answer is YES. You need to repent and alter your lifestyle. You will have to put in a strong effort to avoid sinning again. Changing your friendships and surroundings will help you live a more religious life.

But what happens if I sin again in the future?

God has made provision for the forgiveness of all your sins. If you sin in the future, simply confess to God that you have sinned. You might say something like this to God, “I have sinned. Please forgive me.”

Jesus said, “If you love me, keep my commandments.”Apostle John, 14:15

The Bible says, “This is how we know that we know Him [God]: if we keep His commandments.” Apostle John, 1 John 2:3

The Bible says, “Even so faith, if it has no works [good deeds and righteous behavior], is dead in itself.”  Apostle James 2:17

The Bible clearly states that if good behavior and good deeds do not accompany your belief in Jesus, then your faith is meaningless. When you genuinely become a believer in Jesus, good behavior will naturally follow.