Absolutely agree your doctor was entirely unprofessional, and should no longer be a part of your medical care.
Your parents are not reacting as one might hope. But, to give them grace, perhaps they are worried, confused, etc, addiction is pretty misunderstood by those who haven’t been through it. But there reaction is about them, not you. Try to set boundaries as well as you can (I guess you live together).
Focus on yourself. If you want to quit, then quit. There is plenty of info on here
What’s YOUR plan?
I understand the rage that comes with being doubted and treated like a child. But lashing out, using “at” people, will only hurt you the most. Changed behaviour is the only way to rebuild trust. And changed behaviour also gives you your self esteem back.
Just keep working on yourself, for you. 
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