When you first come up with a goal you're excited about, everything is great. But then somewhere along the way, if the project is a long one, you may experience what I like to call a "doubt funk." You start to think this was a bad idea and you consider giving up.
Should you give up? What should you do about it? Find out here: Refresh Your Goals.
Another important factor affecting your feelings of doubt is your "explanatory style," that is, the habitual way you explain setbacks to yourself. Some ways of explaining setbacks leave your determination intact or even strengthen it. Other ways demoralize you and can lead to doubt funks. Learn more about solving that problem here.