HELP! What should do?

I went to a horseback riding b-day party yesterday, and u learned how to make the horse go, stop, turn, trot, and go on the rail, and I really wanna take classes, but I already do ballet, taekwondo, and piano on top on middle school and homework. i cannnot quit middle school (summers coming up, though). I like ballet 4/10, piano 7/10, and taekwondo 8.5/10.

thanks