You can also take this same attitude with bigger issues in your life. What if you have an addiction (yes, believers have those too) that you are working on and one day have a setback. Will you allow yourself to believe that the setback has ruined everything and you will never get past your addiction? A lot can be turned around in our thought patterns to something positive if we are consciously aware of what we tell ourselves. It is called self-talk. Yes, you may think it is psychological babble, but it is true and it works--to the negative or the positive. You can choose.
Share your issues with a believer in Christ you can trust. Ask that person to pray for you regarding your issue(s)---he or she will be rooting for you like a cheerleader to keep pressing on toward the prize.