It's always darkest before the dawn.
Many people live their lives in a fog that serves as a mantle, a protection, from the feelings that would be too overwhelming to handle if they were allowed to surface. Therefore, when you have a life crisis, you flounder, completely shut down, become depressed and/or cause bodily harm to yourself or others. These are the times that create desperation. Being pushed into a corner in this way may force you to ask for help, or pray for guidance. If not, talk to someone, parents, a friend, or pastor/priest, someone that can help to calm you, your mind, and give you back some hope.
The main thing to realize is that you are not alone, you are never alone. If you need help, you only have to ask for it. Do not sit alone and obsess about how awful your life is, get outside, be among people, breathe in some fresh air, and talk to someone. This, too, shall pass. Things will get better. And they do. Whether it's divine intervention, or you just get sick of yourself, or "time served", the situation eventually clears itself, the solution is found, and there is light at the end of the tunnel again.
"Don't give up before the miracle happens" Fannie Flagg