It's not just a matter of reaching the pedals. Sitting too close to the steering wheel can be dangerous in an accident partly because you would be so much closer to the airbag. Shorter people can also have problems seeing out of the rear window when they are looking behind to reverse.
Getting extenders on the pedals doesn't help with holding the steering wheel comfortably, it is very tiring to drive with your arms stretched out.
Treacle, sit in as many different cars as you can, go on test drives - you will find the right car for you.