Everyone has sinned: Romans 3:23 for all have sinned, and fall short of the glory of God;

The price of sin is death (eternal separation from God): Romans 6:23 For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.

God will forgive us of our sin if we confess: 1 John 1:9 If we confess our sins, he is faithful and righteous to forgive us our sins, and to cleanse us from all unrighteousness.

Jesus came to save us from our sin:  John 3:16 For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life

So therefore: Romans 10:9 that if you will confess with your mouth the Lord Jesus, and believe in your heart that God raised him from the dead, you will be saved.

To know for sure you are going to heaven you simply sincerely pray this prayer:
Dear Lord,  I know I am a sinner, and am sorry for what I have done wrong.  Please forgive me for my wrong doing.  I know and believe that Jesus came to take my punishment for my sin.  Please come into my life and become my savior and my Lord.  Thank you for saving me from my sins.  In Jesus name, Amen.

If you prayed this prayer and meant it please contact a pastor or church leader near you.