OK, a little reality check...

You have a problem. If you are addicted to being high and will do whatever to achieve that high, you have a problem and need to seriously get some help.

Along those lines, you are 16; be sure that in fact your grandmother can have you legally committed to a rehab and/or to a juvenile facility w/o your input. Unless you are legally emancipated, whoever has legal guardian status over you can essentially 'sign you away'. They can ask them to keep you till you're 18. Then on yout 18th birthday, you get $20, some ill-fitting clothes, and a bus ticket to somewhere.

Next, you think you want to live the 'thug' life. If you're stressed now, what do you think your life is going to be like afterwards? Are you prepared for people to be friendly towards you only because you can get them something? Are you ready to watch over your shoulder every day? Are you willing to risk getting busted, getting a felony, and fucking your life over? Have you ever been shot? Stabbed? Stabbed with an ice pick? Slashed with a box cutter? Had someone sick 2 pitbulls on you? SHot someone? Do you like not having a steady source of reliable income? Have you ever attempted to outrun the cops? Have you ever been in jail? You really need to think about because, Sonny Boy, I don't think you really understand what you'd be getting into? You feel like no one think you exist now? What happens when you catch 2 in the back of the head by a crackhead that dumps your body in the woods? You really won't exist then...

Look man, nothing you're going through is new. I've been through shit that'll make your head spin. But with that comes learning. You still have alot of learning to do. If you seriously want to better your situation, you need to seek help for the drug problem, stay focused in school. and volunteer your time. If you do that, I guarantee good things will come your way....in time. Greatness doesn't happen overnight, it must be achieved.