It is true we must forsake the world if we are to be saved. It is true we must bridle our passions and appetites and overcome every carnal and sensual desire if we are to dwell with the Saints eternally. But that is why we are here in mortality - to be tried and tested, to see if we will stand valiantly in the cause of truth and righteousness in spite of the allurements of the world.
There is an eternal law, ordained by God himself before the foundations of the world, that every man shall reap as he sows.
Elder Bruce R. McConkie, "Doctrines of the Restoration", Chapter 22, page 359
One of my favorite books is called "As A Man Thinketh" by James Allen. He says that our characters are a complete sum of all of our thoughts. So, if we think not-so-good things, our character will be not-so-good. In contrast, if we spend our energies thinking positive things, our characters will be positive. The more spiritual and eternal our thoughts, the closer to Christ our characters will be.
It is human nature, a natural man tendency, to forsake future consequences for present appetites. We don't worry about tomorrow because we're not there yet. Everything we sow, will eventually be reaped. It's an eternal law. Like gravity is a law of physics, we cannot escape it. Except bypassing this eternal law of the harvest is not possible by simply flipping a switch or going into outer space.
So overcoming this world and all the carnal appetites found herein, starts with sowing positive, spiritual, eternal thoughts in our minds. Thinking like Christ will result in acting like Christ.