I don’t know that you need to get out of horses, but I think we all get to times in life when we need to get out of project horses. 
One thing that comes to my own mind is that I feel like a young Arab needs attention, exercise, diversions, interesting varied work, adventures, things to keep brain and body busy, as others have said. (And then they are the most magical, wonderful, amazing horses in the known universe.) Other breeds may not need so much to stay in their happy zone.Go find your handsome Arab adolescent a home where he can be with a woman who likes high-maintenance, opinionated, emotionally demanding men and enjoys the occasional drama. In the right home, his behaviors will be gone in a week. Don’t even worry about it. (Speaking as someone who was worried that she had ruined her 17-yo Arab, after a winter of mega ice storms such that we could do no work. She was my first horse, and I had no spine. Madame, sweet and willing when I tried her and previously owned by a 10-yo girl, was a complete witch at the end of it. But, the ice melted, I found a better trainer, and in literally four days, I had a sweet horse again. Your boy will be just fine with someone who has time and energy to make him the center of their existence.)
Come on… join us old ladies, even though you are not one, and go out looking, proudly, for “an old lady horse.” Maybe you could find a horse who is already successfully doing what you, realistically, would be doing with the horse? Could it be that what you want is a sweet, sane, healthy, mid-or late-teens friend who will be perfectly happy hanging out in a nice large paddock, and occasionally going out for a nice grooming session and/or trail ride, maybe a lesson or two here? Older horses have tons of personality to help you fall in love with them. Obviously any new horse will test his new situation, but, with older horses, it’s not such a big deal to them who wins.
