Honestly, I think you need to adjust your priorities and put the career before the horse: there's no point in choosing any career path 'because it will give you time with your horse' if you are then useless at that path. Or just as bad, if you hate it.
Your chosen career will be your main activity, income, and area of growth for years to come - it has to be one that you are interested in, and show an aptitude for.
Whatever you do, if you succeed you will always have time for hobbies including horses. If you succeed in a lucrative profession you will be able to afford the horses too!
Get up, get going, seize the day. Enjoy the sunshine, the rain, cloudy days, snowstorms, and thunder. Getting on your horse is always worth the effort.