Woots,that does seem v v expnsv,even at 20. u should def shop around more(and dont tell them u r a stunt driver in your spare time,haha)
or u could try getting your mum or dad/older family member to go onto a multicar policy with admiral(or some others);I did this along with my gf' and her car/ins at dif dates/brought my policy on my z4 down from 590 to 360,and my gf was £200 cheaper on her ibiza sport 2.0,(and put your mum/dad on it too/sholuld help bring it down.)
also,i insured a modified cavlr turbo(hi grpn) when 19/20,for only £700;which wld be about £1600 now,aprox
hope u find that helpfull,or get something around £1500 for ur ins,cheers