I've having trouble choosing a major for a future career. Any help please?

I was wondering if anyone can please advise me on what I should major in to receive an occupation after university. I seem to be great at math and hard sciences as I appeared to learn the fastest in my class and get the highest grades. I'm NOT trying to say I'm smart; I actually feel I have to constantly prove myself. I'm just trying to give an honest account of what I seem to thrive in. Considering I earned straight As, I suppose I end up being great at anything I know I have to earn a grade for, but my favorite subjects were always the hard sciences. What bothers me is even though I like hard sciences and am good at math when I have to take it, I'm sure there's many many subjects I didn't try that I could really enjoy that I don't know exist yet. Even though I never took physics, I enjoyed the show "Through The Wormhole" with Morgan Freeman and I like Astronomy as well. On the other hand, I'm also deeply interested in politics. The problem with that is I cannot do any public speaking as I'm a stutterer whose stutter becomes immensely worse if I have to prepare a speech and speak in front of people. I am inspired by libertarians like Ron Paul and Peter Schiff, which led me to the Austrian school of economics. I've visited the Mises website and to my dismay, there is no degree to earn with the courses available. I would love to study finance, accounting, and/or economics, but it would have to revolve around that school of thought as opposed to Keynesian. On top of that, I enjoy reading about new forms of renewable energy. As you can see, I have many interests and I just feel very overwhelmed about choosing a major, double major, or even a minor. Could anyone give me some advise? I'd really appreciate it! (I reside in the US)