Death is not the end. Death is really a beginning-another step forward in Heavenly Father's plan for His children. Someday, like everyone else, your physical body will die. But your spirit does not die, it goes to the spirit world, where you will continue to learn and progress and may be with loved ones who have passed on.
Death is a necessary step in your progression, just as your birth was. Sometime after your death, your spirit and your body will be reunited-never to be separated again. This is called resurrection, and it was made possible by the death and Resurrection of Jesus Christ.
At death our spirit is separated from our body and lives in a spirit world until the time when we are all resurrected through Jesus Christ, our spirits being reunited with a now-perfect body that can never die or get sick.
Death is like crossing a street to a side you've never been on, or like going to a movie that you've never seen, or like taking a vacation to a place you've never been. You will cross and find that most everything is the same.
We associate with others just as we do now, and like crossing the street, we think the same thoughts we do now, or like going to the movie we have feelings like we do now, but there will be a difference, and we will note that. We don't have a body, we can't touch with our fingers, we can't taste, we can't vibrate with music, and we miss those things. We can reflect on our life, and that will be our dilemma.
We may want to change some of our attitudes and habits that caused us problems in life, but it will be harder because we don't have our bodies to help us. We can't lose the desire to smoke because our body can't overcome it. We can't lose the desire to get angry quickly because our body can't react to our thoughts. We can't lose the desire to hate because it has been built into our body and deeply entwined into our nerves and fibers.
But we can repent. We can start the process, but not complete it. For complete repentance we will need to wait for the resurrection. In the world spirits we can learn. We can learn good and we can still learn evil. We will still have to choose which we want to learn. Those choices will still be just as hard, if not harder, so we should never delay our repentance because we think it might be easier after we die.