Regarding Fear

I just realized that the only reason people do many things is fear. If you work, you're afraid of not getting fed or keeping up with the quality of life that you are used to. Many exercise because they're afraid of what people think of them, the way people behave often boils down to fear of not being accepted for who they are. We are afraid of each other and what we think about each other. So much of what so many people, including myself at times, is based on fear. How can a individual conquer their fear and help others conquer their fears?