Anxiety happens when you lack self-assurance. God has called us and set our destiny in order. He has given each of us a gift which will make room for us when its glorified. In other words, when God prophesies to us he is looking at what we have, what is in you and your potential. So when you have doubts about your future you are saying that God doesn't know what he is talking about. Although we go through these challenges we will come to a stage when our faith is no longer tested if we endure to the end. Many are called but a few are chosen.