Martin,
If you want to operate on the flight deck you are aspiring towards flight crew.
Anybody can go and study the theory for ATPL theory, but most jobs will also require a certain academic achievement eg 5 O levels/GCSEs and 2 or 3 A levels or equivalent.
The ATPLs will prove quite difficult if you don't have your maths / physics to at least 'O' or GCSE standard.
As the previous poster says, you should research getting these base qualifications at college. It wont do any harm to start a PPL as well.
Man who catch fly with chopstick he say: oops can't remember but something like walk before you run
LF