You shouldn't have bought a car that was a repairable write-off, and you certainly shouldn't have taken out such a large loan while you're studying. You should have picked up an EG from a dealership, and waited until you were old enough.

Anyway, these things happen. As far as your ad goes, it's strange to be selling a car that is supposedly in such good condition without a RWC. That's probably turning a fair few buyers away. Maybe you need to be more upfront about its write-off and RW status.