US Air Force requirements

So, I'm only 16 but can join at 17. I got held back as a kindergartener and am now graduating early, but I am trying to do MEP's and Basic training my junior year during summer break, I have done a whole lot of research and have found that I need at least a GED, so can I still go? I Have a few other questions as well. I have a felony, and the felony was done a couple years ago, I would prefer to not say what the felony was, but will it stop me from joining? I have just one more. I Have no medical conditions, other than ADHD and do not take any sort of medication for it, will my ADHD prohibit me from being able to join?