I'm 23 and the FR is costing me £327 with 5 years no claims and 3 points.
When I was 19 I was paying about £900 for a Ford Escort. Performance cars like Cupras are gonna cost a frickin' fortune for young drivers, and so they should. Hell, I don't trust myself with a 1.6
Ibiza, let alone a 200+ brake Cupra, and neither do the insurers.
You need to get some years no claims under your belt, but for the time being, you can try adding on (preferably older) females, such as your Mum/Aunty providing they've got no accidents or points. That tends to knock quite a chunk off. I added my missus who's 21 onto my FR I'm getting next week and it dropped the price by £80, which is about 20%. Unfortunately my Mother's had a number of arguments with her gate posts, so I couldn't put her on.
I did a quick check and it'd cost me about £1500 to insure a new Cupra. You should do what I'm doing buddy - stick with nice, low insurance group cars, for a few years. Try and get to 25 without killing or maiming anyone and then almost anything is reasonably priced. Unless you've got the cash to burn that is, in which case, go for it and post the pictures!