To alleviate fear, it is important to identify what you are afraid of repeatedly, until you are no longer afraid. As a result, you might experience sweating, shaking, jumpiness, tension, breathlessness, dread, vomiting, etc. Additionally, believing you might be hurt, fail, not get what you need, lose what you have, not have control or die, also feed fear. The roots of this fear come from being in a new situation, or in one where (or like) you or someone you know of has been hurt. From what you have described, it appears you might be dealing with a great deal of fear in your life. Regardless of the source, the emotion is real, and manifests itself in the body and mind.
For 50% you are: All emotions are prompted either by external or internal experiences.