Have you ever experienced a feeling where you just worry about things that never happened?
If so, you have experienced doubt which is an emotion that makes you feel uncertain about anything.
Us, human beings deal with doubt for a variety of reasons such as falling in love with someone that we like, taking on a difficult exam or test or going for a job interview etc.
It gives us a mixture of feelings such as uncertainty, unease and insecurity which makes our thoughts run wild like crazy.
Lead us to fear, anxiety or even the death of one's self.