If you died right now, do you know for sure that you would go to heaven?
You can know for sure.
These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God. 1 John 5:13
Realize that God loves you.
God loves you and has a plan for your life. For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
The Bible says that all are sinners.
For all have sinned, and come short of the glory of God. Romans 3:23 As a descendent of Adam, you were born a sinner. Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: Romans 5:12
The reason you commit sin is because you are a sinner. Your sin keeps you from God.
God's Word also says that sin must be paid for.
For the wages of sin is death...Romans 6:23 A wage is a payment. The payment of your sin is death and hell, separation from God forever. If you go on in your sin, you will die without Christ and be without God forever.
The good news is that Christ paid for your sin.
All your sin was laid on Christ on the cross. He paid your sin debt for you. But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. Romans 5:8
You must personally receive Christ by faith as your Saviour.
The Bible says, For whosoever shall call upon the name of the Lord shall be saved. Romans 10:13
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. Romans 10:9
Christ died for everyone's sin, but only those who receive Christ have eternal life in heaven.
...God hath given to us eternal life, and this life is in his Son (Jesus Christ). He that hath the Son hath life (eternal); and he that hath not the Son of God hath not life. 1 John 5:11-12
Receive Christ as your Saviour.
Believe in your heart as you pray-Lord, I know that I am a sinner. If I died today I would not go to heaven. Thank you for paying for my sin on the cross. I am trusting Christ and only Christ as my Saviour. In Jesus' name, Amen