Whatever you give your attention to, you will attract more evidence of.
If you are focusing on being afraid, you will attract more things, people, situations, etc., that generate fear. If you are keeping your attention on what you prefer -- on feeling good, you will experience more evidence of that.
Simple, but not always easy.
We have default thought patterns, beliefs which keep us giving attention to certain inner and outer stimuli. In order to "change the channel," we must practice.
Can it be done? Absolutely.