DEC may have a good idea there. I was 17 when I went into the USAF. It was through the experience, demands, responsibility, and so forth that I matured and got a better handle on life. I did 21 years and overall I enjoyed it. It wouldn't hurt to go talk to the recruiters. Just remember, they are salesmen who have to make quotas. Be a smart shopper, decide what you want, and then get it in writing.
If your academic description is accurate I'd advise finding a career field that would be mentally stimulating and challenging. Nothing worse for an intelligent guy than to get stuck in a drudge job.
In the mean time, I'd advise you to take whatever work you can. It will provide some income (albeit limited) and keep you occupied. Even in a fast food place, a person who excels can move up to assistant manager. Don't think about a job like that as a dead-end if you're wanting more. Think about it in terms of the experience you'd gain, as in managing a workforce and resources to achieve goals. Management is management. The rest is details.
On a final note, keeping yourself occupied doesn't make problems go away. It just keeps you too busy to think about them. Resolving issues, or just letting go of the petty ones that don't really matter in the long run, will go a long way toward lowering your stress level.
So, get moving and do something! Live your life! Why, if I was 21 again......