How hard is it to acquire a waiver to re-enlist?

I am currently trying to re enlist and have just received a copy of my dd214 after reviewing other questions posed on this site I still don't understand what is required other than to go to talk with a recruiter. I'm more or less just trying to prepare myself for the worst so to speak. I originally joined the ARNG about a year after graduating high school, roughly 19 years old (circa 2010). I chose my MOS solely based on what a friend of mine was(a BIG mistake). Long story short, I did not enjoy what I was doing besides the Army side of things. Not to mention it seems I was one of the more disliked MOSes. But I did complete all the training required of me BCT and AIT(OSUT) but I was unable to to pass the 2 mile run in the required time limit. My last chance to pass the run was a week or so prior to the graduation of AIT in which I on the last couple laps or so I just gave up entirely, lack of motivation to continue because of my failures previously at the run.
Fast forward 10 years, I am now 29, and in a lot better shape than I was then and I want to re enlist with a MOS of my choosing not what someone else chose. But according to my recently reacquired dd214 my re code is 3, uncharacterized, seperation code is JGA, AR 635-200 Chap 11. Do I have any chance at all? Trying to enlist in Active Duty.