[Saul Good]

The guy doesn't want or need advice. Clearly he's intelligent enough to know that he should stop doing drugs, go back to school, graciously accept help from his grandparents, and make something of his life. This isn't brain surgery we're talking about here. It's simply having the self-discipline to do the most basic things in life.
Some people are just weak. This guy is one of them. We all have weaknesses. All the advice in the world won't overcome this weakness, though. It can only be overcome by looking at one's self in the mirror and being disgusted enough in what you see to make a change even though it will cause temporary discomfort.
You clearly have a problem with drugs. You abuse them. You are not the kind of person who can use them in moderation, so you shouldn't use at all. Clearly you have a problem with religion. Most people who have a problem with religion actually have a fear of rightness versus wrongness. Even if you don't believe in God and/or Jesus, you could do worse than living a gracious and moral life. Clearly you have a problem with your parents. I don't know what they've done, nor do I care. They aren't stopping you from making something of your life any more than they are stopping me from making something of mine.
You've got enough pride to defend yourself when someone calls you a loser. That's a good sign. Have enough pride to stop being a puss and go make something of your life.