Hi Liquid Hockey,
If you are still reading this far and not too disillusioned, here's a different view.
Time and money is likely to get you there...eventually...just a question of how long and how much. Early days of flying are usually pretty good indicators of how you are going to progress through the levels from PPL to CPL etc. If you find the early stages hard (perhaps judged by how many hours it takes to get your PPL, go First Solo, pass written exams etc), it's likely you will also find the later stages difficult...etc.
One thing that is cast iron is that you MUST have a Class I Medical to become an Airline Pilot. This is dependent on your body & its physical well-being - a lot of which you can't influence.
My advice to you if you have definitely decided would be to go to the CAA and get a Class I Medical FIRST before shelling out any money on flying training - cos if you are unfortunate enough to fail on something, you won't be able to continue.
Hopefully you will pass this, but you do need to know.
Go to:
www.caa.co.uk Medical Section for info.