If you don't feel sure of yourself, you may want to use Psalm 51 (printed here) as your prayer:
"Be merciful to me, O God,
because of your constant love.
Because of your great mercy wipe away my sins!
Wash away all my evil and make me clean from my sin!
I recognize my faults;
I am always conscious of my sins.
I have sinned against you -- only against you --
and done what you consider evil.
So you are right in judging me;
you are justified in condemning me.
I have been evil from the day I was born;
from the time I was conceived, I have been sinful.
Sincerity and truth are what you require;
fill my mind with your wisdom
Remove my sin, and I will be clean:
wash me, and I will be whiter than snow.
Let me hear the sounds of joy and gladness;
and though you have crushed me and broken me,
I will be happy once again.
Close your eyes to my sins
and wipe out all my evil.
Create a pure heart in me, O God,
and put a new and loyal spirit in me.
Do not banish me from your presence;
do not take your Holy Spirit away from me.
Give me again the joy that comes from your salvation,
and make me willing to obey you.
Then I will teach sinners your commands,
and they will turn back to you.
Spare my life, O God, and save me,
and I will gladly proclaim your righteousness.
Help me to speak, Lord
and I will praise you.
You do not want sacrifices,
or I would offer them;
My sacrifice is a humble spirit, O God;
you will not reject a humble and repentant heart.
Thank you, God, for your saving grace.
Change my heart, O God,
and make me more like you.
In Jesus' name,
Amen
Please let me know (ministry@hisloveministries.org) if you prayed this prayer, whether it was the first time you ever prayed sincerely for salvation or if you needed to get your focus on God. I will pray for you and agree with you to our heavenly Father.