When you give your life to Christ, you immediately have a target on your back.
The reason is because the devil’s opportunity to have you is non-existent but that doesn’t mean he's not going to tempt you or provoke you.
It’s important for you to be aware of his tactics.
Fear looks like the unknown. When you don’t know God and haven’t spent time with Him, your mind is automatically going to go to a place of uncertainty. Maybe the example of God through someone else wasn’t a good one so you created your own image of who God is.