The wording Christ Himself chose to use suggests the result of the lake of fire for human souls (unlike for immortal angel souls) is to "perish", that it will "destroy" human souls, and that those there, not having been given eternal life, will go into the "second death", which is eternal (irreversible). It's in short much like what atheists think the first death is like. It's the real one though. Before that terrible moment, there will be for those that rejected love itself, the worst regret and despair, weeping and gnashing of teeth.
It's not so good a choice, to reject hope, love, trust, all that is good. Instead, God offers an amazing redemption (from all our wrongs!) and rescue to us(!) -- God loves all the world so that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. -- God did not send his Son into the world to condemn the world, but to save the world through him.