Rejected but told to re-apply once 18

Additional information

I applied for the army when I was 15 years 9 months as it is all I've ever wanted to do. I have a history of ocd symptoms, but have never been diagnosed. I had been discharged from camhs but I was rejected and told to re-apply once I was 18. The history will still be there, so I'm just wondering what my chances might be if I reapplied. I had great character references from school and my army cadet Sergeant major. Also, from my gp and the lady I saw for cbt sessions, but was still rejected. I have a shotgun licence, so the gp and police saw no problem with my history. I'm starting uniformed services in September, but my heart is set on the army, but really don't want the heartbreak of being rejected all over again