You're kind of answering your own question.
I think I would be an awesome juggler. But I don't practice and I haven't bothered to learn. Some juggler, eh?
So - don't wait! Is there a drama club at school? Then join, and become a part of it. Don't expect to be a star at first. Hell, don't even expect to have lines. And do volunteer to do other things, such as sew costumes or put on makeup or build sets. Even if you don't do any of this later, it's good work and it's a part of being a team.
If your school doesn't have a drama club, then try summer stock in your area. Many larger towns have some sort of local acting troupe. Same rules apply; don't expect overnight stardom.
If it turns out you love it, then go for it. If it turns out it feels like a chore, then rethink your life plan.
But you need to get off your duff and work on it now, because any Masters' program is going to want to see a portfolio before they admit you, anyway.