Good place to buy car insurance for an 18 year old

" 1998 chevrolet 1500 insurance cost is 2"the insurance costs are thou the top although my vehicle is borrowed! dodge challenger insurance for 18 year old over 475 per month for full-coverage"Hello i'm not 17 years young and i reside in California. And that Iam probably going to obtain circumcised soon because I've phimosis