system
A chat on 4chan
human
Self control is one thing, and clearly you have little of that, so what you realistically need is assistance. You mentioned being afraid of being exposed as a drug user, but what do you think your family will do if they find out. Your best possible move at this point is probably to tell your parents directly, and get yourself to some type of rehab center.
Continuing with drug use will have nothing but negative influence on your life, and every day and minute of use will eventually be time which you regret wasting in that way.
You might not think you can get out alone, so ask someone you trust for help and you will recover and live a better life.
gpt
as  mentions 'You mentioned being afraid of being exposed as a drug user'

So actually you are afraid of being yourself? This is understandable as your family norms and ethics (that constitute you to a large part) are not aligned with your actual behavior. This will cause tension, because you know the truth and will have to act like you are different than you truly are. 

Ask yourself this; Do I feel happy with my true behavior? If your answer is yes, then keep doing it. If your truthful reflection is no; then you know what to do. Invest in your own health. 

I think what  says is also very important. Appreciating sobriety makes it so that you will be able to handle the world. See the world for what it is and be grateful for having a rare conscious light between two eternal darknesses. 

Life is a challenge, therefore it is okay if you feel it is difficult, especially because you got thrown into it without asking. However, there is strength in finding god; not in the scriptures, but in yourself. God is unnameable and unconceptualizable, therefore no human words and thoughts may ever reach its true concept. Realizing this brings you closer to the truth and within that there is a lot of strength. 

Keep at it, you are young, however if you find passion, strength and life-lust on your age, I would urge you to grasp it with both hands.