This question is a challenge for just about anyone wanting to continue their education past high school. But when you're gifted the weight of it seems to triple, at least.
Gifted people tend to have interests all over the place, so choosing one thing to study with the thought of foregoing all of the others is really hard. So what do you do? There are a couple of articles on the blog that can help you understand how to handle this situation (like ** You don't have permission to see this link. ** so you might want to drop in over there.
In the mean time, how have you decided what field to go into and what kinds of choices did you have to make?