First, know that, if you have trusted in Jesus as your savior, you have already been saved. Salvation is an event. You have already passed from death to life.
"Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life." John 5:24
How long is eternal life? Eternal. That means it cannot be taken from you.
Also:
"There is therefore now no condemnation for those who are in Christ Jesus" - Romans 8:1
When you trusted in Christ as your savior, you were born again. You cannot be unborn again. You became a new creation. You were sealed with the Holy Spirit, which guarantees your salvation.
And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory. - Ephesians 1:13-14
So, are you can see, you cannot be separated from Christ once you are united to him. Let this truth sink into your heart. You do not have to be afraid.
"There is no fear in love, but perfect love casts out fear. For fear has to do with punishment, and whoever fears has not been perfected in love." 1 John 4:18
Once the issue of fear of hell is gone, then that paves the way for freedom from sin. It is important to know what God has already done for you through Christ; otherwise, you will be afraid of God and trying to earn your salvation, which cannot be done. It is by grace through faith that we are saved.