It's normal to be scared about things. Some things are frightening to everyone. Other things seem scary except to the person who is scared. Both kids of fear keep us from doing all kinds of things.
In the beginning of Joshua, the Israelites had good reason to be scared. They were going to war. They had no way of knowing if they would be killed or would be victorious. God reminded them they could be strong and courageous and He would be with them.
God doesn't promise he will take away our fear. He does promise to be with us wherever we go. He will strengthen yo and give you courage to face your fears.
"Have I not commanded you? Be strong and courageous. Do not be
terrified; do not be discouraged, for the LORD your God will be with
you wherever you go." Joshua 1:9 (NIV)