From Computer Engineering to another field

[Bipolarity]

I am soon going to be attending college where the only major I will follow is computer engineering (my college doesn't allow switching majors).

1) Once I complete my engineering degree, will I be able to pursue graduate school in economics/computer science? Or do I necessarily need a bachelor's in those fields to be considered for grad schools?

2) What about for the top ranked graduate schools in the US?

3) How easy is economics compared to computer engineering?

4) Can I pick up all economics,computer science and econometrics from textbooks off Amazon?

So far (I am a high school senior) I picked up my first book on micro and macro and it is fairly packed with some calculus. Yet I find it incredibly easy compared to physics,chemistry,analysis all of which I find to be significantly more difficult and time consuming.

5) Is economics really this easy? Or is it just that it's very low level economics that I'm doing right now?

6) What level of mathematics is needed for graduate level economics?

BiP

 

[BorrgSentinel]

I am soon going to be attending college where the only major I will follow is computer engineering (my college doesn't allow switching majors)

BiP

...What kind of College or University doesn't let you switch majors? Maybe you should go to a different school. That sounds shady; also, there is no reason to get a degree in a field you don't like and then go back again for one you do want. This sounds like a mistake. Maybe I misunderstood you.

 

[Bipolarity]

...What kind of College or University doesn't let you switch majors? Maybe you should go to a different school. That sounds shady; also, there is no reason to get a degree in a field you don't like and then go back again for one you do want. This sounds like a mistake. Maybe I misunderstood you.

The Cooper Union. It's a professional engineering school.
But you haven't really answered my question :/
I am not worried about wasting my degree on a field I don't like. I'm worried about whether I will be able pick up the field that I do like from reading Amazon textbooks.

BiP