Rehab
We all make mistakes. Some mistakes are bigger and more serious than others. But as long as we can learn from our mistakes and rectify them, then it is ok to make mistakes.
Some mistakes we make are a normal process of growing up. This can include mixing with the wrong crowd and having the wrong friends. This can lead to worse mistakes such as taking drugs. But if you actually realise that you should not be taking drugs and want to get on to the right road to recovery, then you are already half way there.
Just get yourself checked into a drug rehab? and you are well on your way to getting better / solving your problem / stopping drugs.