Are you sure of your relationship with God? You can be if you follow God's instructions on how to have a right relationship with Him. Here is what to do:
Admit that you have rebelled by not following God's perfect law. (romans 3:23; I John 1:9)
Believe that Jesus is God's only Son, and that His death and resurrection is the only possible payment for your rebellion. (John 3:16; Romans 3:23-26)
Ask Jesus to take the penalty for your rebellious actions (Sins) so that you can be declared right with God. (Romans 10:9; John 1:12)
Commit to place God first in your life by studying and obeying God's Truth in the Holy Bible. (II Timothy 3:16-17)