It's simple, you haven't been driving long enough.
I insured mine for 2K but that is after a 40% discount for 4 plus years of safe driving. A further discount comes from driving for over 10 years. This is for 3 million in liabilty and full collision coverage.
Any accidents erases the 40% and the 4 years starts over. Had any of those?
You also get 1 free claim here. If you get in an own fault collision you can use your freebie and keep your 40% but if you get in another one you're screwed.
Usually people paying 4K for insurance have claims or too many tickets.
Tip: if you get in a small fender bender, pay out of pocket to fix the other car.
It's often cheaper than paying 40% more for your insurance.
Sounds to me like you're not coming clean on your driving record.