In F1 2013 that might be quite a challenge as assists actually increase your tyre wear (for example if you just press the throttle all the way down with TC activated you won't get wheel spin but the game will register as such and the rear tyre wear will increase. Same with ABS - you might not visually lock your wheels but if you just press the break fully and/or steer while it's pressed your front tyre wear will increase). My advice is to turn off the TC and ABS (and auto gears if you can) but keep the racing line for now. You'll improve much faster pace-wise if you manage to adapt to no assists.