Assalamu alaykum,
Bro, I am the same age as you, and my sincere advice is that you have patience and trust in Allah SWT. Firstly, you are far too young to be able to financially support a wife - and this is the time to study and educate yourself, subhanAllah this time we have in our youth to gain foundations and knowledge will not return, so do not waste it worrying about things such as this.
And maybe you could ask your parents to discuss with the girl's parents if you are really concerned, maybe ask them to consider an engagement when you are eighteen or something?
But marriage is rizq and determined by Allah, it reminds me of this 'What is destined will reach you, even if it be underneath two mountains. What is not destined, will not reach you, even if it be between your two lips!"'
This is not really to do with you being 5 doors away or 5 hours away - if the time and situation is right, and if it is intended to be, you will marry her wherever she would be, and if it is not to be, and anything could happen bro, she may not want to get married to you or your own thoughts may change, then she could live next door and you wouldn't marry her. Just don't worry about something you have no control over.