Are you 100% sure you are going to Heaven?
If not then:
* Realize you are a sinner.
Romans 3:23 For all have sinned, and come short of the glory of God;
* Realize the penalty of sin: death, separation from God in Hell.
Romans 6:23a For the wages of sin is death…
* Realize that Jesus paid the debt for you.
Romans 6:23b … but the gift of God is eternal life through Jesus Christ our Lord.
* Realize that God loves you and wants you to be with Him in Heaven some day.
Romans 5:8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
* Call upon Jesus and ask Him to save you; trust Him as your Saviour.
Romans 10:13 For whosoever shall call upon the name of the Lord shall be saved.
Right now you can know you are going to Heaven by receiving Jesus Christ as your personal Saviour.
Bow your head right now and pray something like this, meaning it with all your heart:
Dear Jesus, I know that I am a sinner. Forgive me of my sins. Come into my heart and save me now. I now accept you as my Saviour, in Jesus name, Amen.