I didn't start until I was 18-19. I'm 29 now. Teenage and early adulthood is a difficult time for many. Tons of emotion and hormones, coupled with still figuring things out and exploring the world. It is possible though, and you definitely can do it. It's going to be far from easy, but most everything in life worth while is not easy. Biggest thing is to stay focused on the goal of recovery from addiction no matter what happens. They'll be times when you might give up or feel like giving up, but you have to push on.
And it's more than just pushing forward and white knuckling through the withdrawals. It might involve getting into a new, more stable living situation, dropping some really close friends- maybe even family, doing shit you hate, and putting up with things that feel like too much. This is the work... and it's so hard when you don't see the reward. It's one of those tings where you have to trust in the process, the pay off will come after the work.
What drugs are you using, in what amounts and for how long? What's the longest time you've been clean for? What else is going on in your life? Anything you care to talk about?