Rehab
As I keep mentioning, there is no problem with actually making a mistake as long as you learn from it and correct your errors. Drugs are often experimented with by teenagers. Sometimes, this experimenting, well goes a step too far and people end up using hard drugs and getting addicted.
Thankfully, there are drug rehabilitation? places where you can get help. Often places like Stone Hawk are run by people who have experienced rehabilitation, which is why they have highly successful treatment and rates.
With the right counselling and treatment, you are just one step away from being an ex addict.