Welcome back Corse. I think you should seek some help as well, and sorry that your parents dont' understand - we've all been through that with someone in our lives and it hurts. But we are hurting them too by our drinking/using
The solution is to get sober - and seeking help from doctor or potentially a rehab facility would be a great place to start. None of your your other problems ( anxiety, depression, family issues ) can be solved until you stop drinking or using drugs. You are very young and have a long life ahead of you so I hope you can seek the help you need to turn things around.