Deuteronomy 20:8 And the officers shall speak further unto the people, and they shall say, What man is there that is fearful and fainthearted? let him go and return unto his house, lest his brethren’s heart faint as well as his heart.
When Israel was going to go out to war they were to leave the fearful at home. They would leave those that might give up. Fear, fainting, are both signs of a lack of faith.
When you hang around people that do not believe God you will fall for the same trick or sin. Be careful to get around people that believe God and expect Him to do great things.
If you are feeling fearful, which I often do, then turn to the Scriptures. Think about what God has done in the past. Think about how He got them out of Egypt. Get your heart and mind fixed on the things that God does. Do not believe the lie. Do not doubt God.
Be very careful who your friends are. Their fear, their fainting, and their lack of faith are very contagious!