God knew you long before you were born or even conceived. When you feel discouraged or unworthy, remember that God has always thought of you as something of incredible value. God created you and He doesn't make junk! God has a purpose and a specific plan for your life.
Many times we struggle with new challenges because we lack self-confidence. We should not allow feelings of inadequacy to keep us from obeying God's call. He will always be with you. God will open amazing doors for you if you will completely submit yourself onto Him. If God gives you an assignment to do, he will provide all you need to complete it.