Hell is the place you have chosen in life if you don't love God and don't accept His Son.
The loneliness, devastation and separation from God will feel like an eternal burning fire. To best compare, take a trip to the ADX Florence prison-a supermax prison. The few prisons who have been released say it is a perfection of isolation and totally breaks your spirit unlike any other prison. Hell is the ultimate supermax prison.
How you respond to Christ today is how you will live out in eternity.