When you feel alone you can feel isolated which can be frightening. But even we really have nothing to fear, because God has promised to be there for us and strengthen us at all times. All we need to do is trust Him.
So do not fear, for I am with you; do not be dismayed, for I am your God. I will strengthen you and help you; I will uphold you with my righteous right hand. ~ Isaiah 41:10 (NIV)