Emotions or feelings give our lives context as well as supporting survival.
When you are having an emotional experience, grief, anger, envy, fear, love, there seems to be, associated with the experience, a surge of energy. Emotions also seem to produce a heightened sense of awareness. These states are often important just for our physical survival. Sometimes you become frightened and your adrenilin kicks in and you are all of a sudden stronger. Contrariwise, the anger may exert it's force on your own body and your muscles are 'frozen'.You don't move, so maybe the 'predator' will not see you.
Emotions are the natural result of evolution.