About buying a new road bike...?

I have an XC bike now and I want to switch from XC to road cycling. The problem here is that I'm 16 and I don't have any means of income (aside from my allowance). I can afford a sora and tiagra groupset right now and I still have a few more money. My question is that would it be okay to have a lower end frame, wheels and other parts to buy a sora or tiagra groupset?