I think a good metaphor for life is walking to somewhere. Sometimes, perhaps more so than others, it's freezing outside. You're cold, tired, and don't want to go on anymore, and to make things worse, you don't even know where you're going or how much longer you have to walk.
It's not fun, maybe even miserable, and yet you keep walking. You're tired and you have no idea how much longer you have to walk, and yet you keep walking. Why? Because you know that eventually, somewhere, there's an end to this journey, where you'll be able to sit down someplace warm and comfy and be able to rest.
As you tiredly walk in this cold journey, you see others walk by. There are some who are as cold and tired as you, but there are also some happily jogging, and you wonder to yourself how they could possibly be enjoying themselves when it's freezing outside.
I don't have an answer on how to enjoy the journey, because honestly, I'm still trying to figure it out myself. But what I do know is that you can't stop, you have to keep walking. No matter how tired, cold, and miserable you might be, you have to keep going, because somewhere, somehow, there's a warm place to rest at the end of the journey. And if you stop, you'll never make it, so just keep walking.