As another user put it, realize your mistakes. I believe Sly Stallone in Rocky 6 said to his son "its not how you get hit, its how hard you can get hit and you still keep on going".
Know why it happened and what can be done so you will not hit your lowerst point again. From this point the only way is back up.
Many sportsman, teams have failed before and have come back up, I'm into cricket and their are some world cup winners, finalists who trumiphed over the odds, even sportsman who had their named blacked out like Rossi before 82, only to emerge as the goldon boot and world cup winner, their are many great examples too.
What are your goals? Make something of yourself, know how far you've come in your life, how bad you want it, develop discipline, motivation, be with supportive people, soildier on. Partake in hobbies that you enjoy doing, go to the gym.
Good luck!