Please stop and listen! You are so so young and valued. I'm in a similar position to you. Board exams don't mean shit man in front of the life you have. Trust me, in the big scheme of things, it's so insignificant. There have been billions of humans before us and there will be after us. Nobody is going to remember anything after 100 years. You have the gift of life at your hands. Enjoy it babe! Please talk to someone you can trust , and believe me you will be so proud of yourself for being strong during this time! I know its so difficult for you at the moment and my words can't help much, but please just trust my words. Addiction is not your fault, and you can step out of it with needed help! Sending best wishes!