Welcome to the forums, expect your post to get moved into a different section as you've posted in the "Cabin Crew Wannabes," which isn't really what you are after.
As for CTC and/or becoming an airline pilot you do not NEED to go to university or have a degree. CTC take applicants from 18, but you need to have shown some get up and go in other respects, high grades whilst holding down a weekend job to earn money to pay for flying lessons for example but be a good start. Join an air cadets near you and do as much flying as you can - gliding or powered.
Again, physics isn't essential - but a solid grounding in basic maths and science generally will help with learning along your training. Buy a couple of PPL books (your local flying school can help) and start looking over physics of flight and law to get an idea of what you will need to learn later on.
Good luck - I won't mention the cost, I assume you know it's going to be over £100k already.