I've done a fair amount of cross-country skiing, and am a locally-competitive distance runner. My guess is that if you've never even seen snow, your skiing efficiency will be poor enough that you can't finish (probably because "what's the point", not because you can't make the distance) or end up last against good skiers. Give it a few years, maybe your form will improve enough to be competitive. But it's not like running where you mostly just run.