Keep at it mate, drive safely and it will get better
In my line of 'normal cars', I had a Corsa ( ) for which I paid something over a grand for my first year's insurance. Then my second year on that came to around £800-900. Then I bought my current car, 2000 1.6 Focus, which I paid £600 on last year and just renewed at the beginning of this month for a smidgin over £400, with my now three years NCB
My Defender is around £500, with no NCB (used on the Focus). I'm 20 now, for reference. That's all fully comp, on 10,000 miles a year, living in RH10 postcode.
So as I say, it will improve as time goes on. Just drive safely, if you do have an accident which is shown to be your fault, your premiums will go through the roof. Same goes for motoring convictions such as speeding etc (plus there's the risk in the first two years of losing your license).