Do you believe that attitude can affect outcomes? I have witnessed this in the lives of others, and I have experienced it in my life as well.
When I feel positive about life and project the confident, happy persona I feel inside, things go much better in situations than they do when I go into those same situations with a negative, down-in-the-mouth attitude, certain all will fail and all is doomed.
We've all heard of self-fulfilling prophecies. If we think everything will go wrong, it probably will. However, if we have an expectation of good, most likely we'll find it. Sure, there are exceptions. But, as a rule, attitude can make such a difference.
For me, it's just worth it to try keep my attitude as upbeat and positive as I can. Does that mean ignoring our feelings? No, it's important to be real about what we're feeling. But sometimes we can choose to adjust our attitude, to face our fear and do the feared thing anyway, or even to wait until we feel our confidence level rising and we're ready to face the situation from a more positive stance.
Like the Johnny Mercer song says, "Accentuate the positive, eliminate the negative and latch on to the affirmative...." See what a difference it can make!