Everyone in this life will at sometime be given a mountain to climb. No one is exempt from going through hard things. These types of trials are meant to shape us and make us stronger than we were before. The growth that we gain from these experiences is completely dependent upon how we respond. There will always be pain and sorrow, but we get to decide whether we want to focus on that pain, or focus on the hope of a better tomorrow. We can still make the most of every single day. We can still be happy amidst the chaos. Strive to focus on the good that is in your life and the blessings that you do have. This type of attitude will make the long days feel shorter and the tall mountains seem smaller.
In addition to this, remember that you are NOT alone. You have a Father in Heaven who loves you. You have a Savior who suffered and felt the pain that you are going through right now so that He could be there for you when you needed Him most. There are also people all around you, seen and unseen, who will be there for you. These people WANT to help you through your journey. Rely on them, find strength in each other, and your bond with those people will be fortified in such a way that nothing will ever come between you.