You may need to sacrifice a few shows to work. I work every weekend, saturday and sunday all day and often will work 7 days a week. It is difficult for me to take sundays off to compete, so I rarely do. Even though I'd like to go out more, I can't because I have to work to afford my horse. When I do take the day off, It is for a big competition.
You have to make sacrifices to keep and gain the things you love unfortunately, that is the way of the world and you'll just have to get used to it, as after you leave school time because even shorter.