[imtringued]

>It continues to amaze me how some people know exactly what they want to do in their freshman year or even earlier.

It's pretty easy. People try things out and if they don't like it, they pick something else. When someone appears to know what they want it is because they did the experimentation phase before they chose their field. It looks like you have the "experimentation phase" still ahead of you and there is no shame in that.