Ethical Hacking/Penetration Tester/Security Analysis Career Advice?

Well,

I'm 16, I'm currently taking my GCSEs.

I was interested in this 'hacking' subject since a young child (Since 6-ish).

I've always weirdly thought of it as something cool to hack into something, whether it be downloading a pirated game, to 'hacking' into someone's computer/facebook etc account (hacking, also known as, Guessing, at most)

I'm not sure if this is a plea for attention or something in my younger days, all I know is that I'm still interested in it.

Also, As you may have realized by this point, I LOVE computers.

A careers advisor came to my school, and showed me a excellent website that led me to this career-

http://search.ucas.com/cgi-bin/hsrun/search/search...

This definitely peaked my interests, and after a lot of pondering around the internet for information, I'm still left with many questions..

So,

(1) Do I have to deal with a lot of codes?

(2) What programs do I use?

(3) Recommended A level choices, and is Media useful?

(4) Is it hard?

(5) What do I learn basically?

(6) Salary summary, if possible :3.

By the looks of it, I may need someone who's worked in this business or at least known someone who has, because google doesn't seem to offer that much information.

Finally, have a look at my GCSE/A-level choices-

GCSE-

ICT

Psychology

History

Geography (Which I regret picking at this point)

A level (What I'm planning to pick)-

ICT

Psychology

Media/Sociology

History/Philosophy

(7) Any recommendations to what I should pick?

Sorry for this lengthy post, I really hope someone helps me out here, and helps answer some of these questions, I'm pretty lose here /:.