In my opinion, this life is not to determine what you like or what would make you happy, that was the first estate test when we had all the options before us. This life is to show what the true desires of our heart are despite being in a fallen state. It is to show how much we like those things, to what degree.
I think a good metaphor would be the soldier in training who says they would never leave a fellow soldier behind but not everyone in the heat of the battle and in that confusing state would actually go back for their fellow soldier. When one has a chance to reveal what takes priority over other things, that is when what really makes a person happy or not is revealed. As Elder Bednar puts it, the true test of this life is to see if we follow the promptings and desires of the body or do we follow the desires of the spirit? That is what President Nelson said in his talk that thinking Celestial means being spiritually minding. It is just another way of saying, are we spiritually minded or carnally minded. What pulls at our heart the most? God will interpret our actions with that in mind, what is our true desire of the heart.
