You are confused. Confusion is a flavor of Fear.
So you've got to keep an eye out for what it is you are afraid of. My guess is that you are afraid you'll screw it up, you wont get it right, you'll choose one thing and change your mind later? It will all be a waste... Right? Ultimately the reason is of little importance.
Notice the fear.
Just sit with the feeling of confusion (fear) without striving to change it for long enough that it transforms. Cultivate it. Tend to it. Cuddle with it. Sleep with it. Have sex with it.
Just keep allowing the fear.
FEAR. FEAR. FEAR. FEAR.
A Storm of Fear.
Once the storm has passed, answers will become clear.
Right now, you are striving.
I understand you feel as though you are constrained by time, I realize this decision feels as though it needs to be made NOW, but it doesn't. No need to do something you are unsure about just for the sake of making a decision. Just keep doing what you are already doing. And if you can not decide now, then that is exactly what you are doing, not deciding. That is why when you major in something there is an option of "UNDECIDED".
Because, you can BE undecided.
Until you are not.