How can you lower 17 years olds car insurance quotes ?

hi, im 16 and turning 17 in a few months, im looking at quotes for cars for example: cars with 1.0 to 1.2 engines an that are 10 years old or more.
for example: vw polo 1.2 - 11k and paying £1500 a month. i know this cant be right can someone help please !
Update: the 11k is the annual price, sorry forgot to say, also what is cheaper monthly or yearly ?