Hmm, so you're about 7-8 seconds a lap slower than me? Just to start with the basics, are you using a wheel or controller? If controller, do you have it on max sensitivity, and do you have the stick fully moved to the side while cornering? Sorry if that sounds very basic, but the basic idea is you need to be on the limit of grip throughout each corner, which means having the stick fully moved, and using your speed/throttle to control your line, so you brake or lift off to tighten your line, or accelerate to widen your line. If you have any way to record yourself doing it, and can put it on YouTube, I'm happy to have a look to try to help you go faster (and others on here will be happy to try to help, too).