Being scared is a good, life protecting emotion to have because it IS a narrow road we must travel to eternal life. The main desire of God is for you to have it, there is actual joy in heaven when you chose this. But there are requirements.
God wants the people in heaven with Him who really choose to be there. The opposite of heaven is sin and lots of people choose that. God knows we are human, it is impossible for us to keep completely away from sin, because sin isn't only what we actually do, it includes our thoughts and desires. That is why he gave Jesus. There were thousands of years of history of the world before Jesus lived as a man and was crucified, but Jesus always was in eternal time. Until He came, blood of animals were used as a symbol of the blood. It wasn't as effective, but until Jesus arrived, they were saved in a sort of sleep. Now, through taking our sin to Jesus, it is completely done away with through His blood and our repentance.
So any information you find in scripture about Jesus you must follow. Don't follow what I say or what any man says about it, lots of us misunderstand. God directly to the word for your information. After you understand there is Christ, you will be given the Holy Spirit to help your understanding.
When you take your sins to Christ, when Christ cleanses you, that is a guarantee you will have eternal life, but just as the Lord's Prayer uses the word "daily" that we ask for all of what scripture means about bread, this is something we need to make park of us every day. Christ's way replaces our personal egotistic way every minute of the day.