You should ask your presumed significant other (re: 
young lady friend) if she can see herself becoming seriously involved with you, and discuss the possibility of what marriage holds toward your combined futures. 
It might give her a jolt of 
"woah. this American guy I met in Europe is already contemplating marriage?! (pauses)" ... but, given that you'd like some advice here, I suppose it takes an inference that you might actually like the broad, if not actually grow to love her; though, your current individual life situations has you in doubt about whether or not to move forward with this. 
I'd close this message with a nice witticism of my own, but I just glanced at this, and it bears heeding in its informed brevity:
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					Originally Posted by jewels
					
				 
				If you both want it enough, it will endure and things will work themselves out. Make sure you talk out any real concerns with her though. 
			
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