Yep. To become a pilot flying the big shiny jets, you need:
A Class1 medical.
Piloting ability and skill.
An airline transport pilot's licence, ATPL(A).
Probably a type rating.
A way of funding your ATPL training.
An ability to assimilate and learn a LOT of information.
Luck.
I would apply for your Class 1 medical as soon as possible - a few hundred pounds, and I don't know if there is a minimum age limit - search the CAA website. If there is a medical issue, you need to know now before you spend any further money.
Take a trial lesson or two in a propellor aircraft at your local flying school or GA airfield. See if you like it. Or maybe try glider flying.
Look into joining the RAF, (when old enough).
It is a
very long haul from where you are to getting your ATPL, if that is what you want, and you basically have to chose between buying your training or getting onto the housing ladder.
I worked in my first career for almost 20 years before changing career and signing up for a full-time ATPL course. So I had a mortgage, and I had the funds to pay for it and the ATPL.
Good luck
