It's AWD so it'll understeer more than an FR, go and have a look at the tuning forum and there should be some tunes to make it a little more pliable in turns. Soft tyres, downforce (buy some Aero parts from GT Auto), brake balance, LSD, torque distributing centre differentials with a rearward bias and weight reductions will all help handling one way or another, by which I really mean that downforce only works at speed, on slow corners like London's you won't notice much benefit, but on the Speedway circuits you will.
Also if you turn the racing line on and compare it to how you were driving, you may see where you were going wrong. That adjusts according to your car so if you're really struggling it'll tell you when you're going too fast. It's not the best line, though, it's roughly accurate but there's often a better approach to a corner, especially depending on your driving style.