Is
this the bike you bought? I'm not familiar with your currency or bike values where you live, so I can't say whether that's a good deal. Looks like a perfectly functional bike to me, though.
I don't think you'll gain much from going to a road bike. My local bike club's website lists 3 groups for most club rides: racers, fast riders, and leisure riders, with typical average speeds of 20 mph, 18 mph, and 15 mph respectively. 30kmh works out to about 18 mph, so if you're keeping that kind of pace riding solo without the benefit of a paceline, you're doing pretty well!
Ride what you have for awhile. I'd make sure you have a good fit before I'd start shopping for a new bike.