There is no reason to fear. The Lord is with you. That is a promise that God made to people. The Lord did not give you the sprit of fear, but of power, love, and a sound mind.
The world that we live in is filled with trouble. Just know that He has overcome the world. When you begin to realize that God is in control and he cares for you, you will begin to trust him more.
Sickness, disease, war, violence, break-ins, and the list goes on. If you watch the news channel you will see more negative mishaps than anything positive. These are all reasons to cause fear to enter into our minds. If we allow these fears to settle into our minds and hearts, we will be unable to do God's Will for our lives.
You may be confused about God's Will. It is simple. Love one another. If we could love one another with agape, unconditional love, wars and violence would be eliminated.