You can be thankful you're still very young and you can turn this around, for sure. Mistakes are not our enemy. They're not there to hurt us, but to help us realize that this is the way we learn and grow in life...ALL through life. When we know better, we do better, so don't beat yourself up, because we're all in the same boat. What's great about challenges like this, is that they are great warning signals that something is wrong in our lives and definitely needs to be changed. While it's tempting for every one of us to look back and regret our past, we can be thankful that it taught us a good lesson(s), so we don't repeat the same mistakes. And even the reason we feel like failures, is not because of the mistake, but because life actually gives us a gift. It helps us remember our bad choices, so we don't hurt ourselves by repeating them. It's a safety mechanism. Our mind trying to protect us. It actually helps improve our lives.
Nothing is ruined. Tomorrow is a new day and you can start brand new, only with much better understanding. God has given us great resiliency and imagination. We are great problem solvers, and the best thing is, we can change things up when we don't like something, so we shouldn't underestimate that gift. We're not losers at all! We get another chance, and that's pretty awesome and exciting!