I can only speak for myself, but I suspect you'll find this helping attitude prevalent amongst GA members.
You don't need to say anything. Just get your ass in gear and find out how to get your GED.
My payback will be seeing a copy of your first decent paycheck from a stable job.
Look at it this way. I've had a long and successful life. I've always enjoyed helping kids. You won't be the first or the last young man I help. I'm about to put a young man through college. I sort of feel like I have an obligation to help out when I can, and I'm glad I can do so.
It really doesn't matter to me how well I know you. All I need to know is you're young, in need of some help to get you to a point where you can stand on your own, and whatever I can do within reason to facilitate that is worth it to me.