It is not natural for man to be brave and courageous. We become so because of our confidence in God as he guides and protects us. If you take notice, when God commands us to be courageous, he follows it up with a reason! Check this out;
"Fear not for I am your shield." (Genesis 15:1)
"Fear not for I am the one who helps you." (Isaiah 41:14)
"Even though I walk through the darkest valley, I will fear no evil, for you are with me, your rod and staff, they comfort me." (Psalm 23:4)
God is a God with a back up plan and a promise. His plan can never be thwarted, therefore, every circumstance of life is subservient to His will!
So break free from fear and become strong and courageous through God's strength!