I understand how you feel. I have a prayer journal that I used to write all my prayers down in, and once God answered them I would go back and journal His answer and how He answered me. Its very encouraging to see His faithfulness. I need to go back to this practice because, speaking for myself, sometimes circumstances in life can cause you to forget what He's already done and just how awesome He is.
Just remember, if He brought you this far in life its not to leave you there but to keep going. And know that He ALWAYS has your best interest in heart. He has never told me to do something that was for my harm, always for my good. God doesn't give us a spirit of fear, but instead a spirit of power, love, and a sound mind. So rebuke that spirit of fear and doubt, pray, make your descision, and walk in faith. Hope that helps!