Sometimes life takes a massive s*** on your face, but you gotta do your best to wipe that s*** off. It's not going to be easy, but it's definitely possible. You just gotta focus on the positive possibilities.
If you're a Debbie downer, you'll be a self-fulfilling prophecy, and no one wants that. You have to stay positive and use this situation as a lesson learned.
But seriously, please don't think your life is over. As the saying goes: s*** happens. Everyone screws up at least once in their life. Besides, you can't change the past, but you CAN change the future. So, don't dwell on what happened; focus on what you can do to make yourself right.
Just remember: If you don't try, you're not going to get what you want. So do yourself some good and focus on how you're going to make yourself a better person from this point forward.

You'll be pleasantly surprised with what you can do.