Don't worry about it you are fine and have a job which means you can train and not have to take out loans to be able to afford it.
First get your backside down to Gatwick and get a class 1 medical then take it from there.
Be warned though any advice on here on the way to go is all abit suspect just now as nobody really knows whats going to happen in the next couple of years.
Your 21 so you could save all the money for a CTC course, you could get the PPL and plug away at the "tagged" schemes. Or you could save your cash and go modular.
Quite what the job prospects are going to in 18 months time knowbody knows apart from it will a choice of grim, pretty grim, utterly grim or not a chance in hell.
You really don't want to be paying off a loan for the next 10 years if you can help it.