Rae, asking us what we think you'd be "good at" is the wrong question, I think. I can tell by your posts -- from both the content and the way you express yourself -- that you are very bright, and bright people can learn to be good at just about anything. In fact, the whole concept of "giftedness" is flawed. Upon examination, it turns out that people who have apparent natural "gifts" have in fact simply put in hours and hours of practice. Often they don't see it as such because the practice is enjoyable, and approached as a form of play, but still. That's what the research shows. I can back it up with my own experience, too.
So. The real question should be, "What sort of work will I find fulfilling?", and only you can find the answer to that. And there are likely several possible answers, just as there are likely a number of people you might have married with whom you could have been happy. You chose one man, and he's awesome, but had you not met him, you might have met another who is equally awesome. (The good thing about a career, of course, is that if you want to change it, it's much less heartbreaking than deciding to change your marriage partner, lol).
As for how to find a good career path when you're feeling a little directionless? Well, start asking around. Ask everybody you know about their jobs, about the parts they like, the parts they don't like, why they chose it, etc. Get a book like "What Color is Your Parachute?" or the one by Barbara Sher that Parsley suggested. Actually do the exercises in the book and it might help narrow your choices.
You've got two more things on your side, besides being smart. You've got time, for one thing -- you're still very young. And you've also indicated that you may not want children, which means you will have a lot more career flexibility than many women. It's a lot easier to change careers (and many people end up changing careers, not just jobs, several times in their lives) when you're not also juggling the demanding and financially stressful job of raising a family.
ETA: one more thing. Don't get too hung up on choosing the "perfect" career. Give it careful thought, but then pick something. And follow through. If you find, after a few years, that it's not working for you, it is always possible to change to something else. Sometimes it's easier to find what you enjoy by discovering, through trial and error, what you definitely DON'T enjoy.
