Last year in college, and I have no clue what I'm doing with my major. I'm a Political Science major, and while my interest does lie in politics/policy I don't expect to be using the major in the way that we learn about it in class. I find that is the case with a lot of majors (of course this bars most of the STEM courses). I know a friend who studied genetics then went to law school. The undergraduate major really isn't all that important.

Now in terms of your interest:

But there is something I want to grow more proficient in, something I also think I have a bit of a knack for. And that’s motivating, coordinating, leading, challenging, and developing young people.

In what way do you want to do all those things? I find that general ideas of motivation aren't always useful? Do you want to motivate/challenge/coordinate/develop youth to be more involved in a cause? Environment? Schooling? Politics? Do you want to help others indirectly through policy change? Or do you want a more direct role? What you have there is really too general of a interest. You need to focus in on one aspect of helping others/youth. I'm not sure if there is a major that you should necessarily look into because so many aspects of different majors could fit the description you've given. With that said as long as it isn't a financial burden I still recommend attending college.