The empty feeling.

The feeling of emptiness is like emotional hunger where you are hungry for something you can't have or get. Depression is one of the strongest reason that can make you feel empty and the combination of both depression and emptiness can be really annoying. You need to figure out your unsatisfied need that is causing this feeling to overcome it. As everyone's unique, each person has a different reason for his / her empty feeling. Most of the people who have the empty feeling inside them have a self understanding problem. Like, if you know that you failed to reach your goal then you would say you are disappointed not empty. In other words, people use this word emptiness to describe a feeling they can't understand. So, gaining self understanding is the most important step in dealing with emptiness and all unwanted emotions. 
You can gain self respect by adhering your values, be brave, never escape and by keeping promises. Keeping promises: Not only the promise you give to others, but also the promises that you give to yourself.

I show not your face but your heart's desire. Erised stra ehru oyt ube eafru oyt on wohsi.

- Mirror of Erised