Majors

I will be going to a university next year. But I'm doubtful what concerns specialization in a specific subject, the only thing I'm currently certain about is that I will be joining the field of science.

Currently, my advance profile classes are these (I don't know how stuff works in the US, but we can only get specializations based on our AP classes, and getting into a university for me will not be hard because currently my grades are around the region of ~96-98%)

Mathematics, Biology, Chemistry and Physics.

I am currently highly interested in:
Biochemistry,
Bio engineering,
Mechanical Engineering,
Automation,
Molecular Biology.

Which one of these majors are the most interesting, or the most useful? Or would you prefer to choose something else yourself?

The bio related fields are in high demand, and might one day cure cancer (that is killing /b/ or otherwise).

MechE doesn't pay well, from what I've heard.

I'm doing physics; it's interesting, but pays even crappier than MechE.