Even if you believe Satan exists you should not worry about him..
All you need to do is be who you actually are. Define yourself you as who you really are by your thoughts, words and actions.
You cannot fool God by pretending to be somebody you are not.
God sees the wonder in each of you and do not fear him.
He will take care of you.
If there is Satan, he cannot be very bright. Only a fool believes he can be an enemy of God and win.