Progress toward your goals is never going to be a straight line, there are always bumps in the road to send you off course. The trick is to avoid getting discouraged and get back on track. It's our thinking that either motivates us or doesn't. There are ways of thinking that create self-motivation.
Every human has the capacity for genius.
Find your inner Einstein. As adults we have become used to using our imaginations only for worrying. We visualize worst case scenarios all day long. Worry is a misuse of imagination, it was designed for better things. Use your imagination to create and acheive things that worriers never dream of acheiving.